21231200213212 has 72 divisors (see below), whose sum is σ = 42806081783808. Its totient is φ = 9189561115680.

The previous prime is 21231200213147. The next prime is 21231200213221.

21231200213212 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (22).

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, 1793848 + ... + 6758719.

It is an arithmetic number, because the mean of its divisors is an integer number (594528913664).

Almost surely, 2^{21231200213212} is an apocalyptic number.

21231200213212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21231200213212 is an abundant number, since it is smaller than the sum of its proper divisors (21574881570596).

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

21231200213212 is a wasteful number, since it uses less digits than its factorization.

21231200213212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8552839 (or 8552826 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

It can be divided in two parts, 21231200 and 213212, that added together give a palindrome (21444412).

The spelling of 21231200213212 in words is "twenty-one trillion, two hundred thirty-one billion, two hundred million, two hundred thirteen thousand, two hundred twelve".