21221332302 has 16 divisors (see below), whose sum is σ = 42444600912. Its totient is φ = 7073454720.

The previous prime is 21221332289. The next prime is 21221332343. The reversal of 21221332302 is 20323312212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89368 + ... + 224564.

It is an arithmetic number, because the mean of its divisors is an integer number (2652787557).

Almost surely, 2^21221332302 is an apocalyptic number.

21221332302 is an abundant number, since it is smaller than the sum of its proper divisors (21223268610).

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

21221332302 is a wasteful number, since it uses less digits than its factorization.

21221332302 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161363.

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

Adding to 21221332302 its reverse (20323312212), we get a palindrome (41544644514).

The spelling of 21221332302 in words is "twenty-one billion, two hundred twenty-one million, three hundred thirty-two thousand, three hundred two".