21213613400024 has 32 divisors (see below), whose sum is σ = 39815547347520. Its totient is φ = 10596136029696.

The previous prime is 21213613399991. The next prime is 21213613400029. The reversal of 21213613400024 is 42000431631212.

It is a self number, because there is not a number n which added to its sum of digits gives 21213613400024.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213613400029) 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, 92652374 + ... + 92881050.

It is an arithmetic number, because the mean of its divisors is an integer number (1244235854610).

Almost surely, 2^{21213613400024} is an apocalyptic number.

It is an amenable number.

21213613400024 is a deficient number, since it is larger than the sum of its proper divisors (18601933947496).

21213613400024 is a wasteful number, since it uses less digits than its factorization.

21213613400024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240299 (or 240295 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The spelling of 21213613400024 in words is "twenty-one trillion, two hundred thirteen billion, six hundred thirteen million, four hundred thousand, twenty-four".