21525425122 has 8 divisors (see below), whose sum is σ = 32289012972. Its totient is φ = 10762420800.

The previous prime is 21525425107. The next prime is 21525425161. The reversal of 21525425122 is 22152452512.

It can be written as a sum of positive squares in 2 ways, for example, as 21483058041 + 42367081 = 146571^2 + 6509^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37579 + ... + 210862.

Almost surely, 2^21525425122 is an apocalyptic number.

21525425122 is a deficient number, since it is larger than the sum of its proper divisors (10763587850).

21525425122 is a wasteful number, since it uses less digits than its factorization.

21525425122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291764.

The product of its digits is 16000, while the sum is 31.

Adding to 21525425122 its reverse (22152452512), we get a palindrome (43677877634).

The spelling of 21525425122 in words is "twenty-one billion, five hundred twenty-five million, four hundred twenty-five thousand, one hundred twenty-two".