21221120210 has 16 divisors (see below), whose sum is σ = 38343260736. Its totient is φ = 8456171568.

The previous prime is 21221120203. The next prime is 21221120251. The reversal of 21221120210 is 1202112212.

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, 4031804 + ... + 4037063.

It is an arithmetic number, because the mean of its divisors is an integer number (2396453796).

Almost surely, 2^21221120210 is an apocalyptic number.

21221120210 is a deficient number, since it is larger than the sum of its proper divisors (17122140526).

21221120210 is a wasteful number, since it uses less digits than its factorization.

21221120210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8069137.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21221120210 its reverse (1202112212), we get a palindrome (22423232422).

The spelling of 21221120210 in words is "twenty-one billion, two hundred twenty-one million, one hundred twenty thousand, two hundred ten".