21213406213560 has 96 divisors (see below), whose sum is σ = 75211167498480. Its totient is φ = 5142643929600.

The previous prime is 21213406213537. The next prime is 21213406213609. The reversal of 21213406213560 is 6531260431212.

21213406213560 is a `hidden beast` number, since 2 + 1 + 2 + 1 + 34 + 0 + 62 + 1 + 3 + 560 = 666.

It is a super-3 number, since 3×21213406213560³ (a number of 41 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2678456421 + ... + 2678464340.

Almost surely, 2^{21213406213560} is an apocalyptic number.

21213406213560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21213406213560 is an abundant number, since it is smaller than the sum of its proper divisors (53997761284920).

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

21213406213560 is a wasteful number, since it uses less digits than its factorization.

21213406213560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5356920789 (or 5356920782 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

Adding to 21213406213560 its reverse (6531260431212), we get a palindrome (27744666644772).

The spelling of 21213406213560 in words is "twenty-one trillion, two hundred thirteen billion, four hundred six million, two hundred thirteen thousand, five hundred sixty".