21211001222122 has 16 divisors (see below), whose sum is σ = 32034353464512. Its totient is φ = 10532991867840.

The previous prime is 21211001222111. The next prime is 21211001222161. The reversal of 21211001222122 is 22122210011212.

It is a self number, because there is not a number n which added to its sum of digits gives 21211001222122.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26725023 + ... + 27507250.

It is an arithmetic number, because the mean of its divisors is an integer number (2002147091532).

Almost surely, 2^{21211001222122} is an apocalyptic number.

21211001222122 is a deficient number, since it is larger than the sum of its proper divisors (10823352242390).

21211001222122 is a wasteful number, since it uses less digits than its factorization.

21211001222122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54233613.

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

Adding to 21211001222122 its reverse (22122210011212), we get a palindrome (43333211233334).

The spelling of 21211001222122 in words is "twenty-one trillion, two hundred eleven billion, one million, two hundred twenty-two thousand, one hundred twenty-two".