21221322202 has 16 divisors (see below), whose sum is σ = 32399495424. Its totient is φ = 10422594000.

The previous prime is 21221322179. The next prime is 21221322233. The reversal of 21221322202 is 20222312212.

It is a self number, because there is not a number n which added to its sum of digits gives 21221322202.

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, 237249 + ... + 314212.

It is an arithmetic number, because the mean of its divisors is an integer number (2024968464).

Almost surely, 2^21221322202 is an apocalyptic number.

21221322202 is a deficient number, since it is larger than the sum of its proper divisors (11178173222).

21221322202 is a wasteful number, since it uses less digits than its factorization.

21221322202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551805.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21221322202 its reverse (20222312212), we get a palindrome (41443634414).

The spelling of 21221322202 in words is "twenty-one billion, two hundred twenty-one million, three hundred twenty-two thousand, two hundred two".