21421324332 has 72 divisors (see below), whose sum is σ = 54521908896. Its totient is φ = 7091276544.

The previous prime is 21421324297. The next prime is 21421324403. The reversal of 21421324332 is 23342312412.

21421324332 is a `hidden beast` number, since 2 + 1 + 4 + 2 + 1 + 324 + 332 = 666.

It is a super-2 number, since 2×21421324332² (a number of 21 digits) contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 21421324296 and 21421324305.

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, 9010728 + ... + 9013104.

Almost surely, 2^21421324332 is an apocalyptic number.

It is an amenable number.

21421324332 is an abundant number, since it is smaller than the sum of its proper divisors (33100584564).

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

21421324332 is a wasteful number, since it uses less digits than its factorization.

21421324332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4007 (or 4002 counting only the distinct ones).

The product of its digits is 6912, while the sum is 27.

Adding to 21421324332 its reverse (23342312412), we get a palindrome (44763636744).

The spelling of 21421324332 in words is "twenty-one billion, four hundred twenty-one million, three hundred twenty-four thousand, three hundred thirty-two".