21012311222 has 12 divisors (see below), whose sum is σ = 36664339140. Its totient is φ = 9005276196.

The previous prime is 21012311213. The next prime is 21012311231. The reversal of 21012311222 is 22211321012.

It is an interprime number because it is at equal distance from previous prime (21012311213) and next prime (21012311231).

It is a self number, because there is not a number n which added to its sum of digits gives 21012311222.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 107205572 + ... + 107205767.

It is an arithmetic number, because the mean of its divisors is an integer number (3055361595).

Almost surely, 2^21012311222 is an apocalyptic number.

21012311222 is a deficient number, since it is larger than the sum of its proper divisors (15652027918).

21012311222 is a wasteful number, since it uses less digits than its factorization.

21012311222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214411355 (or 214411348 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21012311222 its reverse (22211321012), we get a palindrome (43223632234).

The spelling of 21012311222 in words is "twenty-one billion, twelve million, three hundred eleven thousand, two hundred twenty-two".