21123331012212 has 72 divisors (see below), whose sum is σ = 58343186407968. Its totient is φ = 5908624054080.

The previous prime is 21123331012123. The next prime is 21123331012271. The reversal of 21123331012212 is 21221013332112.

It is a super-2 number, since 2×21123331012212² (a number of 27 digits) contains 22 as substring.

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, 559509918 + ... + 559547669.

It is an arithmetic number, because the mean of its divisors is an integer number (810322033444).

Almost surely, 2^{21123331012212} is an apocalyptic number.

21123331012212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21123331012212 is an abundant number, since it is smaller than the sum of its proper divisors (37219855395756).

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

21123331012212 is a wasteful number, since it uses less digits than its factorization.

21123331012212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1119057629 (or 1119057616 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 21123331012212 its reverse (21221013332112), we get a palindrome (42344344344324).

The spelling of 21123331012212 in words is "twenty-one trillion, one hundred twenty-three billion, three hundred thirty-one million, twelve thousand, two hundred twelve".