21213555613629 has 4 divisors (see below), whose sum is σ = 28284740818176. Its totient is φ = 14142370409084.

The previous prime is 21213555613603. The next prime is 21213555613651. The reversal of 21213555613629 is 92631655531212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21213555613629 - 2⁷ = 21213555613501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213555613429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3535592602269 + ... + 3535592602274.

It is an arithmetic number, because the mean of its divisors is an integer number (7071185204544).

Almost surely, 2^{21213555613629} is an apocalyptic number.

It is an amenable number.

21213555613629 is a deficient number, since it is larger than the sum of its proper divisors (7071185204547).

21213555613629 is an equidigital number, since it uses as much as digits as its factorization.

21213555613629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7071185204546.

The product of its digits is 2916000, while the sum is 51.

The spelling of 21213555613629 in words is "twenty-one trillion, two hundred thirteen billion, five hundred fifty-five million, six hundred thirteen thousand, six hundred twenty-nine".