21521102234 has 16 divisors (see below), whose sum is σ = 32347654560. Its totient is φ = 10738575120.

The previous prime is 21521102233. The next prime is 21521102261. The reversal of 21521102234 is 43220112512.

It is not an unprimeable number, because it can be changed into a prime (21521102233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2117537 + ... + 2127675.

It is an arithmetic number, because the mean of its divisors is an integer number (2021728410).

Almost surely, 2^21521102234 is an apocalyptic number.

21521102234 is a deficient number, since it is larger than the sum of its proper divisors (10826552326).

21521102234 is a wasteful number, since it uses less digits than its factorization.

21521102234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12205.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 21521102234 its reverse (43220112512), we get a palindrome (64741214746).

The spelling of 21521102234 in words is "twenty-one billion, five hundred twenty-one million, one hundred two thousand, two hundred thirty-four".