21001211220110 has 32 divisors (see below), whose sum is σ = 41370495269472. Its totient is φ = 7612405332480.

The previous prime is 21001211220107. The next prime is 21001211220127. The reversal of 21001211220110 is 1102211210012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 304949759 + ... + 305018618.

It is an arithmetic number, because the mean of its divisors is an integer number (1292827977171).

Almost surely, 2^{21001211220110} is an apocalyptic number.

21001211220110 is a deficient number, since it is larger than the sum of its proper divisors (20369284049362).

21001211220110 is a wasteful number, since it uses less digits than its factorization.

21001211220110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609968708.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21001211220110 its reverse (1102211210012), we get a palindrome (22103422430122).

The spelling of 21001211220110 in words is "twenty-one trillion, one billion, two hundred eleven million, two hundred twenty thousand, one hundred ten".