21213610641613 has 8 divisors (see below), whose sum is σ = 22854143183256. Its totient is φ = 19574323291200.

The previous prime is 21213610641581. The next prime is 21213610641631. The reversal of 21213610641613 is 31614601631212.

It can be written as a sum of positive squares in 4 ways, for example, as 3600631486089 + 17612979155524 = 1897533^2 + 4196782^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21213610641613 - 2⁵ = 21213610641581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213610641673) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 311262418 + ... + 311330563.

It is an arithmetic number, because the mean of its divisors is an integer number (2856767897907).

Almost surely, 2^{21213610641613} is an apocalyptic number.

It is an amenable number.

21213610641613 is a deficient number, since it is larger than the sum of its proper divisors (1640532541643).

21213610641613 is a wasteful number, since it uses less digits than its factorization.

21213610641613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622595615.

The product of its (nonzero) digits is 31104, while the sum is 37.

The spelling of 21213610641613 in words is "twenty-one trillion, two hundred thirteen billion, six hundred ten million, six hundred forty-one thousand, six hundred thirteen".