21213244024 has 32 divisors (see below), whose sum is σ = 45461808000. Its totient is φ = 9090419040.

The previous prime is 21213244009. The next prime is 21213244027. The reversal of 21213244024 is 42044231212.

It is a self number, because there is not a number n which added to its sum of digits gives 21213244024.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213244027) 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, 810259 + ... + 836029.

It is an arithmetic number, because the mean of its divisors is an integer number (1420681500).

Almost surely, 2^21213244024 is an apocalyptic number.

It is an amenable number.

21213244024 is an abundant number, since it is smaller than the sum of its proper divisors (24248563976).

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

21213244024 is a wasteful number, since it uses less digits than its factorization.

21213244024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40483 (or 40479 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21213244024 its reverse (42044231212), we get a palindrome (63257475236).

The spelling of 21213244024 in words is "twenty-one billion, two hundred thirteen million, two hundred forty-four thousand, twenty-four".