21212538913269 has 48 divisors (see below), whose sum is σ = 34095189772800. Its totient is φ = 12600562344480.

The previous prime is 21212538913249. The next prime is 21212538913283. The reversal of 21212538913269 is 96231983521212.

21212538913269 is a `hidden beast` number, since 2 + 1 + 2 + 12 + 538 + 9 + 1 + 32 + 69 = 666.

It is not a de Polignac number, because 21212538913269 - 2⁹ = 21212538912757 is a prime.

It is a super-2 number, since 2×21212538913269² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212538913249) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6715287 + ... + 9355220.

It is an arithmetic number, because the mean of its divisors is an integer number (710316453600).

Almost surely, 2^{21212538913269} is an apocalyptic number.

It is an amenable number.

21212538913269 is a deficient number, since it is larger than the sum of its proper divisors (12882650859531).

21212538913269 is a wasteful number, since it uses less digits than its factorization.

21212538913269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16070790 (or 16070787 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 54.

The spelling of 21212538913269 in words is "twenty-one trillion, two hundred twelve billion, five hundred thirty-eight million, nine hundred thirteen thousand, two hundred sixty-nine".