21121443532 has 18 divisors (see below), whose sum is σ = 42997224732. Its totient is φ = 9052047144.

The previous prime is 21121443527. The next prime is 21121443557. The reversal of 21121443532 is 23534412112.

It is a super-2 number, since 2×21121443532² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 21121443532.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53881038 + ... + 53881429.

Almost surely, 2^21121443532 is an apocalyptic number.

It is an amenable number.

21121443532 is an abundant number, since it is smaller than the sum of its proper divisors (21875781200).

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

21121443532 is a wasteful number, since it uses less digits than its factorization.

21121443532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107762485 (or 107762476 counting only the distinct ones).

The product of its digits is 5760, while the sum is 28.

Adding to 21121443532 its reverse (23534412112), we get a palindrome (44655855644).

The spelling of 21121443532 in words is "twenty-one billion, one hundred twenty-one million, four hundred forty-three thousand, five hundred thirty-two".