21221302332 has 24 divisors (see below), whose sum is σ = 49597166416. Its totient is φ = 7062225408.

The previous prime is 21221302327. The next prime is 21221302439. The reversal of 21221302332 is 23320312212.

It is a happy number.

It is a super-2 number, since 2×21221302332² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21221302299 and 21221302308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1435093 + ... + 1449804.

Almost surely, 2^21221302332 is an apocalyptic number.

It is an amenable number.

21221302332 is an abundant number, since it is smaller than the sum of its proper divisors (28375864084).

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

21221302332 is a wasteful number, since it uses less digits than its factorization.

21221302332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2885517 (or 2885515 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21221302332 its reverse (23320312212), we get a palindrome (44541614544).

The spelling of 21221302332 in words is "twenty-one billion, two hundred twenty-one million, three hundred two thousand, three hundred thirty-two".