21256311365212 has 96 divisors (see below), whose sum is σ = 48994565921280. Its totient is φ = 7817477080320.

The previous prime is 21256311365197. The next prime is 21256311365281.

21256311365212 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4935523 + ... + 8177530.

It is an arithmetic number, because the mean of its divisors is an integer number (510360061680).

Almost surely, 2^{21256311365212} is an apocalyptic number.

21256311365212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21256311365212 is an abundant number, since it is smaller than the sum of its proper divisors (27738254556068).

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

21256311365212 is a wasteful number, since it uses less digits than its factorization.

21256311365212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13113371 (or 13113369 counting only the distinct ones).

The product of its digits is 129600, while the sum is 40.

The spelling of 21256311365212 in words is "twenty-one trillion, two hundred fifty-six billion, three hundred eleven million, three hundred sixty-five thousand, two hundred twelve".