21021112001222 has 4 divisors (see below), whose sum is σ = 31531668001836. Its totient is φ = 10510556000610.

The previous prime is 21021112001213. The next prime is 21021112001231. The reversal of 21021112001222 is 22210021112012.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21021112001213) and next prime (21021112001231).

It is a self number, because there is not a number n which added to its sum of digits gives 21021112001222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5255278000304 + ... + 5255278000307.

It is an arithmetic number, because the mean of its divisors is an integer number (7882917000459).

Almost surely, 2^{21021112001222} is an apocalyptic number.

21021112001222 is a deficient number, since it is larger than the sum of its proper divisors (10510556000614).

21021112001222 is a wasteful number, since it uses less digits than its factorization.

21021112001222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10510556000613.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21021112001222 its reverse (22210021112012), we get a palindrome (43231133113234).

The spelling of 21021112001222 in words is "twenty-one trillion, twenty-one billion, one hundred twelve million, one thousand, two hundred twenty-two".