2151120125251 has 4 divisors (see below), whose sum is σ = 2157905993472. Its totient is φ = 2144334257032.

The previous prime is 2151120125237. The next prime is 2151120125257. The reversal of 2151120125251 is 1525210211512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2151120125251 - 2⁷ = 2151120125123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2151120125257) 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, 3392933635 + ... + 3392934268.

It is an arithmetic number, because the mean of its divisors is an integer number (539476498368).

Almost surely, 2^{2151120125251} is an apocalyptic number.

2151120125251 is a deficient number, since it is larger than the sum of its proper divisors (6785868221).

2151120125251 is an equidigital number, since it uses as much as digits as its factorization.

2151120125251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6785868220.

The product of its (nonzero) digits is 2000, while the sum is 28.

Adding to 2151120125251 its reverse (1525210211512), we get a palindrome (3676330336763).

The spelling of 2151120125251 in words is "two trillion, one hundred fifty-one billion, one hundred twenty million, one hundred twenty-five thousand, two hundred fifty-one".