21224213525464 has 16 divisors (see below), whose sum is σ = 40167319991400. Its totient is φ = 10512928194432.

The previous prime is 21224213525447. The next prime is 21224213525521. The reversal of 21224213525464 is 46452531242212.

21224213525464 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 21224213525464.

It is a congruent number.

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, 12397320129 + ... + 12397321840.

Almost surely, 2^{21224213525464} is an apocalyptic number.

It is an amenable number.

21224213525464 is a deficient number, since it is larger than the sum of its proper divisors (18943106465936).

21224213525464 is a wasteful number, since it uses less digits than its factorization.

21224213525464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24794642082 (or 24794642078 counting only the distinct ones).

The product of its digits is 921600, while the sum is 43.

Adding to 21224213525464 its reverse (46452531242212), we get a palindrome (67676744767676).

The spelling of 21224213525464 in words is "twenty-one trillion, two hundred twenty-four billion, two hundred thirteen million, five hundred twenty-five thousand, four hundred sixty-four".