21122133312 has 56 divisors (see below), whose sum is σ = 63869311936. Its totient is φ = 6034894848.

The previous prime is 21122133287. The next prime is 21122133323. The reversal of 21122133312 is 21333122112.

It is a tau number, because it is divible by the number of its divisors (56).

It is a super-2 number, since 2×21122133312² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7856593 + ... + 7859280.

Almost surely, 2^21122133312 is an apocalyptic number.

It is an amenable number.

21122133312 is an abundant number, since it is smaller than the sum of its proper divisors (42747178624).

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

21122133312 is a wasteful number, since it uses less digits than its factorization.

21122133312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15715895 (or 15715885 counting only the distinct ones).

The product of its digits is 432, while the sum is 21.

Adding to 21122133312 its reverse (21333122112), we get a palindrome (42455255424).

The spelling of 21122133312 in words is "twenty-one billion, one hundred twenty-two million, one hundred thirty-three thousand, three hundred twelve".