2151356121 has 6 divisors (see below), whose sum is σ = 3107514410. Its totient is φ = 1434237408.

The previous prime is 2151356093. The next prime is 2151356143. The reversal of 2151356121 is 1216531512.

2151356121 is a `hidden beast` number, since 2 + 15 + 1 + 35 + 612 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1748912400 + 402443721 = 41820^2 + 20061^2 .

It is not a de Polignac number, because 2151356121 - 2⁵ = 2151356089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2151356191) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 119519776 + ... + 119519793.

Almost surely, 2^2151356121 is an apocalyptic number.

It is an amenable number.

2151356121 is a deficient number, since it is larger than the sum of its proper divisors (956158289).

2151356121 is a wasteful number, since it uses less digits than its factorization.

2151356121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239039575 (or 239039572 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 2151356121 is about 46382.7136010820. The cubic root of 2151356121 is about 1290.9341872110.

Adding to 2151356121 its reverse (1216531512), we get a palindrome (3367887633).

The spelling of 2151356121 in words is "two billion, one hundred fifty-one million, three hundred fifty-six thousand, one hundred twenty-one".