21220432402 has 32 divisors (see below), whose sum is σ = 35197473024. Its totient is φ = 9532790400.

The previous prime is 21220432399. The next prime is 21220432403. The reversal of 21220432402 is 20423402212.

It is not an unprimeable number, because it can be changed into a prime (21220432403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 436353 + ... + 482539.

It is an arithmetic number, because the mean of its divisors is an integer number (1099921032).

Almost surely, 2^21220432402 is an apocalyptic number.

21220432402 is a deficient number, since it is larger than the sum of its proper divisors (13977040622).

21220432402 is a wasteful number, since it uses less digits than its factorization.

21220432402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46674.

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 21220432402 its reverse (20423402212), we get a palindrome (41643834614).

The spelling of 21220432402 in words is "twenty-one billion, two hundred twenty million, four hundred thirty-two thousand, four hundred two".