21222221122110 has 32 divisors (see below), whose sum is σ = 50933962628640. Its totient is φ = 5659188750848.

The previous prime is 21222221122087. The next prime is 21222221122111. The reversal of 21222221122110 is 1122112222212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222221122111) 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, 1907175 + ... + 6788354.

It is an arithmetic number, because the mean of its divisors is an integer number (1591686332145).

Almost surely, 2^{21222221122110} is an apocalyptic number.

21222221122110 is an abundant number, since it is smaller than the sum of its proper divisors (29711741506530).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21222221122110 is a wasteful number, since it uses less digits than its factorization.

21222221122110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8776892.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21222221122110 its reverse (1122112222212), we get a palindrome (22344333344322).

The spelling of 21222221122110 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twenty-one million, one hundred twenty-two thousand, one hundred ten".