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1000212121 = 4323260747
BaseRepresentation
bin111011100111100…
…000011010011001
32120201002001002101
4323213200122121
54022023241441
6243130003401
733533443216
oct7347403231
92521061071
101000212121
11473659197
1223ab76561
1312c2b28bc
1496ba4b0d
155cc24231
hex3b9e0699

1000212121 has 4 divisors (see below), whose sum is σ = 1023472912. Its totient is φ = 976951332.

The previous prime is 1000212107. The next prime is 1000212133. The reversal of 1000212121 is 1212120001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1212120001 = 5791209311.

It is a cyclic number.

It is not a de Polignac number, because 1000212121 - 213 = 1000203929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1000212098 and 1000212107.

It is not an unprimeable number, because it can be changed into a prime (1000212151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11630331 + ... + 11630416.

It is an arithmetic number, because the mean of its divisors is an integer number (255868228).

Almost surely, 21000212121 is an apocalyptic number.

It is an amenable number.

1000212121 is a deficient number, since it is larger than the sum of its proper divisors (23260791).

1000212121 is an equidigital number, since it uses as much as digits as its factorization.

1000212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23260790.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1000212121 is about 31626.1303513408. The cubic root of 1000212121 is about 1000.0707020011.

Adding to 1000212121 its reverse (1212120001), we get a palindrome (2212332122).

The spelling of 1000212121 in words is "one billion, two hundred twelve thousand, one hundred twenty-one".

Divisors: 1 43 23260747 1000212121