21122455624 has 32 divisors (see below), whose sum is σ = 40503139200. Its totient is φ = 10324267200.

The previous prime is 21122455621. The next prime is 21122455687. The reversal of 21122455624 is 42655422112.

It is a self number, because there is not a number n which added to its sum of digits gives 21122455624.

It is not an unprimeable number, because it can be changed into a prime (21122455621) 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, 101622 + ... + 229285.

It is an arithmetic number, because the mean of its divisors is an integer number (1265723100).

Almost surely, 2^21122455624 is an apocalyptic number.

It is an amenable number.

21122455624 is a deficient number, since it is larger than the sum of its proper divisors (19380683576).

21122455624 is a wasteful number, since it uses less digits than its factorization.

21122455624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331093 (or 331089 counting only the distinct ones).

The product of its digits is 38400, while the sum is 34.

Adding to 21122455624 its reverse (42655422112), we get a palindrome (63777877736).

The spelling of 21122455624 in words is "twenty-one billion, one hundred twenty-two million, four hundred fifty-five thousand, six hundred twenty-four".