21121222221110 has 32 divisors (see below), whose sum is σ = 41577827516064. Its totient is φ = 7661291200000.

The previous prime is 21121222221109. The next prime is 21121222221137. The reversal of 21121222221110 is 1112222212112.

It is a super-2 number, since 2×21121222221110² (a number of 27 digits) contains 22 as substring.

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, 239371241 + ... + 239459460.

It is an arithmetic number, because the mean of its divisors is an integer number (1299307109877).

Almost surely, 2^{21121222221110} is an apocalyptic number.

21121222221110 is a deficient number, since it is larger than the sum of its proper divisors (20456605294954).

21121222221110 is a wasteful number, since it uses less digits than its factorization.

21121222221110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478831120.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21121222221110 its reverse (1112222212112), we get a palindrome (22233444433222).

The spelling of 21121222221110 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twenty-two million, two hundred twenty-one thousand, one hundred ten".