21213403645213 has 16 divisors (see below), whose sum is σ = 22894080523776. Its totient is φ = 19539725662080.

The previous prime is 21213403645193. The next prime is 21213403645249. The reversal of 21213403645213 is 31254630431212.

It is not a de Polignac number, because 21213403645213 - 2⁹ = 21213403644701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213403642213) 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, 30698956 + ... + 31382362.

It is an arithmetic number, because the mean of its divisors is an integer number (1430880032736).

Almost surely, 2^{21213403645213} is an apocalyptic number.

It is an amenable number.

21213403645213 is a deficient number, since it is larger than the sum of its proper divisors (1680676878563).

21213403645213 is a wasteful number, since it uses less digits than its factorization.

21213403645213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688524.

The product of its (nonzero) digits is 103680, while the sum is 37.

The spelling of 21213403645213 in words is "twenty-one trillion, two hundred thirteen billion, four hundred three million, six hundred forty-five thousand, two hundred thirteen".