21231111113212 has 96 divisors (see below), whose sum is σ = 49952120408064. Its totient is φ = 7625396160000.

The previous prime is 21231111113189. The next prime is 21231111113257.

21231111113212 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 31 ways as a sum of consecutive naturals, for example, 523273 + ... + 6537280.

It is an arithmetic number, because the mean of its divisors is an integer number (520334587584).

Almost surely, 2^{21231111113212} is an apocalyptic number.

21231111113212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21231111113212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24976060204032).

21231111113212 is an abundant number, since it is smaller than the sum of its proper divisors (28721009294852).

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

21231111113212 is a wasteful number, since it uses less digits than its factorization.

21231111113212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7061339 (or 7061337 counting only the distinct ones).

The product of its digits is 144, while the sum is 22.

It can be divided in two parts, 2123111 and 1113212, that added together give a palindrome (3236323).

The spelling of 21231111113212 in words is "twenty-one trillion, two hundred thirty-one billion, one hundred eleven million, one hundred thirteen thousand, two hundred twelve".