21612525052075 has 12 divisors (see below), whose sum is σ = 26800469882368. Its totient is φ = 17289414352800.

The previous prime is 21612525052031. The next prime is 21612525052093. The reversal of 21612525052075 is 57025052521612.

It is a happy number.

It is not a de Polignac number, because 21612525052075 - 2⁹ = 21612525051563 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14413611 + ... + 15842260.

Almost surely, 2^{21612525052075} is an apocalyptic number.

21612525052075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21612525052075 is a deficient number, since it is larger than the sum of its proper divisors (5187944830293).

21612525052075 is a wasteful number, since it uses less digits than its factorization.

21612525052075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30284454 (or 30284449 counting only the distinct ones).

The product of its (nonzero) digits is 420000, while the sum is 43.

Adding to 21612525052075 its reverse (57025052521612), we get a palindrome (78637577573687).

The spelling of 21612525052075 in words is "twenty-one trillion, six hundred twelve billion, five hundred twenty-five million, fifty-two thousand, seventy-five".