21210221222110 has 32 divisors (see below), whose sum is σ = 38473612139520. Its totient is φ = 8418736266528.

The previous prime is 21210221222089. The next prime is 21210221222119. The reversal of 21210221222110 is 1122212201212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210221222119) 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, 15003082 + ... + 16355821.

It is an arithmetic number, because the mean of its divisors is an integer number (1202300379360).

Almost surely, 2^{21210221222110} is an apocalyptic number.

21210221222110 is a deficient number, since it is larger than the sum of its proper divisors (17263390917410).

21210221222110 is a wasteful number, since it uses less digits than its factorization.

21210221222110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31359432.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21210221222110 its reverse (1122212201212), we get a palindrome (22332433423322).

The spelling of 21210221222110 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred ten".