21231122113212 has 48 divisors (see below), whose sum is σ = 54455397220224. Its totient is φ = 6384561352000.

The previous prime is 21231122113181. The next prime is 21231122113213.

21231122113212 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×21231122113212² (a number of 27 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231122113213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 613882839 + ... + 613917422.

It is an arithmetic number, because the mean of its divisors is an integer number (1134487442088).

Almost surely, 2^{21231122113212} is an apocalyptic number.

21231122113212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21231122113212 is an abundant number, since it is smaller than the sum of its proper divisors (33224275107012).

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

21231122113212 is a wasteful number, since it uses less digits than its factorization.

21231122113212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1227800410 (or 1227800408 counting only the distinct ones).

The product of its digits is 576, while the sum is 24.

It can be divided in two parts, 2123112 and 2113212, that added together give a palindrome (4236324).

The spelling of 21231122113212 in words is "twenty-one trillion, two hundred thirty-one billion, one hundred twenty-two million, one hundred thirteen thousand, two hundred twelve".