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1121221201 = 5321155117
BaseRepresentation
bin100001011010100…
…0111101001010001
32220010202221100011
41002311013221101
54244013034301
6303131354521
736533136322
oct10265075121
92803687304
101121221201
1152599a0a1
122735b2a41
1314b3a0bc9
14a8ca4449
1568678a51
hex42d47a51

1121221201 has 4 divisors (see below), whose sum is σ = 1142376372. Its totient is φ = 1100066032.

The previous prime is 1121221183. The next prime is 1121221223. The reversal of 1121221201 is 1021221211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1021221211 = 1144789213.

It can be written as a sum of positive squares in 2 ways, for example, as 311875600 + 809345601 = 17660^2 + 28449^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121221201 - 25 = 1121221169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1121221291) 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, 10577506 + ... + 10577611.

It is an arithmetic number, because the mean of its divisors is an integer number (285594093).

Almost surely, 21121221201 is an apocalyptic number.

It is an amenable number.

1121221201 is a deficient number, since it is larger than the sum of its proper divisors (21155171).

1121221201 is an equidigital number, since it uses as much as digits as its factorization.

1121221201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21155170.

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

The square root of 1121221201 is about 33484.6412702899. The cubic root of 1121221201 is about 1038.8761284478.

Adding to 1121221201 its reverse (1021221211), we get a palindrome (2142442412).

The spelling of 1121221201 in words is "one billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred one".

Divisors: 1 53 21155117 1121221201