21502525222434 has 16 divisors (see below), whose sum is σ = 43118520239520. Its totient is φ = 7148596775040.

The previous prime is 21502525222397. The next prime is 21502525222459. The reversal of 21502525222434 is 43422252520512.

It is a junction number, because it is equal to n+sod(n) for n = 21502525222392 and 21502525222401.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4727905647 + ... + 4727910194.

It is an arithmetic number, because the mean of its divisors is an integer number (2694907514970).

Almost surely, 2^{21502525222434} is an apocalyptic number.

21502525222434 is an abundant number, since it is smaller than the sum of its proper divisors (21615995017086).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21502525222434 is a wasteful number, since it uses less digits than its factorization.

21502525222434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9455816225.

The product of its (nonzero) digits is 384000, while the sum is 39.

Adding to 21502525222434 its reverse (43422252520512), we get a palindrome (64924777742946).

The spelling of 21502525222434 in words is "twenty-one trillion, five hundred two billion, five hundred twenty-five million, two hundred twenty-two thousand, four hundred thirty-four".