21131211132 has 72 divisors (see below), whose sum is σ = 55914872832. Its totient is φ = 6720487200.

The previous prime is 21131211121. The next prime is 21131211149. The reversal of 21131211132 is 23111213112.

21131211132 is a `hidden beast` number, since 211 + 312 + 11 + 132 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54108 + ... + 212579.

It is an arithmetic number, because the mean of its divisors is an integer number (776595456).

Almost surely, 2^21131211132 is an apocalyptic number.

It is an amenable number.

21131211132 is an abundant number, since it is smaller than the sum of its proper divisors (34783661700).

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

21131211132 is a wasteful number, since it uses less digits than its factorization.

21131211132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266799 (or 266794 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

Adding to 21131211132 its reverse (23111213112), we get a palindrome (44242424244).

The spelling of 21131211132 in words is "twenty-one billion, one hundred thirty-one million, two hundred eleven thousand, one hundred thirty-two".