21213645324 has 48 divisors (see below), whose sum is σ = 50873356800. Its totient is φ = 6877480896.

The previous prime is 21213645317. The next prime is 21213645329. The reversal of 21213645324 is 42354631212.

It is not an unprimeable number, because it can be changed into a prime (21213645329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103479 + ... + 230510.

It is an arithmetic number, because the mean of its divisors is an integer number (1059861600).

Almost surely, 2^21213645324 is an apocalyptic number.

It is an amenable number.

21213645324 is an abundant number, since it is smaller than the sum of its proper divisors (29659711476).

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

21213645324 is a wasteful number, since it uses less digits than its factorization.

21213645324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334142 (or 334140 counting only the distinct ones).

The product of its digits is 34560, while the sum is 33.

The spelling of 21213645324 in words is "twenty-one billion, two hundred thirteen million, six hundred forty-five thousand, three hundred twenty-four".