21221220112122 has 32 divisors (see below), whose sum is σ = 44297954205120. Its totient is φ = 6770998282880.

The previous prime is 21221220112121. The next prime is 21221220112139. The reversal of 21221220112122 is 22121102212212.

It is not an unprimeable number, because it can be changed into a prime (21221220112121) 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, 813808872 + ... + 813834947.

It is an arithmetic number, because the mean of its divisors is an integer number (1384311068910).

Almost surely, 2^{21221220112122} is an apocalyptic number.

21221220112122 is an abundant number, since it is smaller than the sum of its proper divisors (23076734092998).

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

21221220112122 is a wasteful number, since it uses less digits than its factorization.

21221220112122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1627643918.

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

Adding to 21221220112122 its reverse (22121102212212), we get a palindrome (43342322324334).

The spelling of 21221220112122 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twenty million, one hundred twelve thousand, one hundred twenty-two".