21121433532 has 48 divisors (see below), whose sum is σ = 54780230400. Its totient is φ = 7037783280.

The previous prime is 21121433521. The next prime is 21121433569. The reversal of 21121433532 is 23533412112.

21121433532 is a `hidden beast` number, since 2 + 1 + 121 + 4 + 3 + 3 + 532 = 666.

It is a super-2 number, since 2×21121433532² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21121433496 and 21121433505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 256719 + ... + 328857.

It is an arithmetic number, because the mean of its divisors is an integer number (1141254800).

Almost surely, 2^21121433532 is an apocalyptic number.

It is an amenable number.

21121433532 is an abundant number, since it is smaller than the sum of its proper divisors (33658796868).

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

21121433532 is a wasteful number, since it uses less digits than its factorization.

21121433532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74863 (or 74855 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

Adding to 21121433532 its reverse (23533412112), we get a palindrome (44654845644).

The spelling of 21121433532 in words is "twenty-one billion, one hundred twenty-one million, four hundred thirty-three thousand, five hundred thirty-two".