21223513524 has 24 divisors (see below), whose sum is σ = 52434563328. Its totient is φ = 6658357120.

The previous prime is 21223513523. The next prime is 21223513529. The reversal of 21223513524 is 42531532212.

It is a junction number, because it is equal to n+sod(n) for n = 21223513491 and 21223513500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223513523) 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, 52018212 + ... + 52018619.

It is an arithmetic number, because the mean of its divisors is an integer number (2184773472).

Almost surely, 2^21223513524 is an apocalyptic number.

It is an amenable number.

21223513524 is an abundant number, since it is smaller than the sum of its proper divisors (31211049804).

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

21223513524 is a wasteful number, since it uses less digits than its factorization.

21223513524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104036855 (or 104036853 counting only the distinct ones).

The product of its digits is 14400, while the sum is 30.

The spelling of 21223513524 in words is "twenty-one billion, two hundred twenty-three million, five hundred thirteen thousand, five hundred twenty-four".