25701021291 has 16 divisors (see below), whose sum is σ = 37386000000. Its totient is φ = 15575253120.

The previous prime is 25701021263. The next prime is 25701021299. The reversal of 25701021291 is 19212010752.

It is not a de Polignac number, because 25701021291 - 2⁷ = 25701021163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25701021299) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 806835 + ... + 838083.

It is an arithmetic number, because the mean of its divisors is an integer number (2336625000).

Almost surely, 2^25701021291 is an apocalyptic number.

25701021291 is a deficient number, since it is larger than the sum of its proper divisors (11684978709).

25701021291 is a wasteful number, since it uses less digits than its factorization.

25701021291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56186.

The product of its (nonzero) digits is 2520, while the sum is 30.

The spelling of 25701021291 in words is "twenty-five billion, seven hundred one million, twenty-one thousand, two hundred ninety-one".