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1021122121 = 1039913807
BaseRepresentation
bin111100110111010…
…001011001001001
32122011102101012211
4330313101121021
54042401401441
6245154105121
734206252265
oct7467213111
92564371184
101021122121
11484440188
12245b7b1a1
13133724296
14998890a5
155e9a4a81
hex3cdd1649

1021122121 has 4 divisors (see below), whose sum is σ = 1031036032. Its totient is φ = 1011208212.

The previous prime is 1021122107. The next prime is 1021122173. The reversal of 1021122121 is 1212211201.

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.

It is a cyclic number.

It is not a de Polignac number, because 1021122121 - 27 = 1021121993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021122101) 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, 4956801 + ... + 4957006.

It is an arithmetic number, because the mean of its divisors is an integer number (257759008).

Almost surely, 21021122121 is an apocalyptic number.

It is an amenable number.

1021122121 is a deficient number, since it is larger than the sum of its proper divisors (9913911).

1021122121 is an equidigital number, since it uses as much as digits as its factorization.

1021122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9913910.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1021122121 is about 31955.0015021123. The cubic root of 1021122121 is about 1006.9917090766.

Adding to 1021122121 its reverse (1212211201), we get a palindrome (2233333322).

The spelling of 1021122121 in words is "one billion, twenty-one million, one hundred twenty-two thousand, one hundred twenty-one".

Divisors: 1 103 9913807 1021122121