21000221222013 has 12 divisors (see below), whose sum is σ = 33091257683328. Its totient is φ = 12727406801160.

The previous prime is 21000221221979. The next prime is 21000221222033. The reversal of 21000221222013 is 31022212200012.

21000221222013 is a `hidden beast` number, since 210 + 0 + 0 + 221 + 2 + 220 + 13 = 666.

It is not a de Polignac number, because 21000221222013 - 2³² = 20995926254717 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000221222033) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 106061723245 + ... + 106061723442.

It is an arithmetic number, because the mean of its divisors is an integer number (2757604806944).

Almost surely, 2^{21000221222013} is an apocalyptic number.

It is an amenable number.

21000221222013 is a deficient number, since it is larger than the sum of its proper divisors (12091036461315).

21000221222013 is a wasteful number, since it uses less digits than its factorization.

21000221222013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212123446704 (or 212123446701 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21000221222013 its reverse (31022212200012), we get a palindrome (52022433422025).

The spelling of 21000221222013 in words is "twenty-one trillion, two hundred twenty-one million, two hundred twenty-two thousand, thirteen".