21012011021222 has 48 divisors (see below), whose sum is σ = 34419447640368. Its totient is φ = 9563438327040.

The previous prime is 21012011021189. The next prime is 21012011021227. The reversal of 21012011021222 is 22212011021012.

It is a self number, because there is not a number n which added to its sum of digits gives 21012011021222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012011021227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1504828013 + ... + 1504841975.

It is an arithmetic number, because the mean of its divisors is an integer number (717071825841).

Almost surely, 2^{21012011021222} is an apocalyptic number.

21012011021222 is a deficient number, since it is larger than the sum of its proper divisors (13407436619146).

21012011021222 is a wasteful number, since it uses less digits than its factorization.

21012011021222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24985 (or 24912 counting only the distinct ones).

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

Adding to 21012011021222 its reverse (22212011021012), we get a palindrome (43224022042234).

The spelling of 21012011021222 in words is "twenty-one trillion, twelve billion, eleven million, twenty-one thousand, two hundred twenty-two".