21221121132 has 18 divisors (see below), whose sum is σ = 53642278508. Its totient is φ = 7073707032.

The previous prime is 21221121067. The next prime is 21221121149. The reversal of 21221121132 is 23112112212.

21221121132 is a `hidden beast` number, since 212 + 211 + 211 + 32 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×21221121132² (a number of 21 digits) contains 22 as substring.

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 an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 294737758 + ... + 294737829.

Almost surely, 2^21221121132 is an apocalyptic number.

It is an amenable number.

21221121132 is an abundant number, since it is smaller than the sum of its proper divisors (32421157376).

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

21221121132 is a wasteful number, since it uses less digits than its factorization.

21221121132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 589475597 (or 589475592 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

Adding to 21221121132 its reverse (23112112212), we get a palindrome (44333233344).

The spelling of 21221121132 in words is "twenty-one billion, two hundred twenty-one million, one hundred twenty-one thousand, one hundred thirty-two".