21213415202664 has 32 divisors (see below), whose sum is σ = 53033808924000. Its totient is φ = 7071102278592.

The previous prime is 21213415202663. The next prime is 21213415202669. The reversal of 21213415202664 is 46620251431212.

It is a super-2 number, since 2×21213415202664² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21213415202663) 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, 2766547 + ... + 7076765.

It is an arithmetic number, because the mean of its divisors is an integer number (1657306528875).

Almost surely, 2^{21213415202664} is an apocalyptic number.

21213415202664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21213415202664 is an abundant number, since it is smaller than the sum of its proper divisors (31820393721336).

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

21213415202664 is a wasteful number, since it uses less digits than its factorization.

21213415202664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4515297 (or 4515293 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 39.

Adding to 21213415202664 its reverse (46620251431212), we get a palindrome (67833666633876).

The spelling of 21213415202664 in words is "twenty-one trillion, two hundred thirteen billion, four hundred fifteen million, two hundred two thousand, six hundred sixty-four".