21000022313 has 8 divisors (see below), whose sum is σ = 21224352576. Its totient is φ = 20776014000.

The previous prime is 21000022301. The next prime is 21000022331. The reversal of 21000022313 is 31322000012.

It is a happy number.

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 21000022313 - 2⁴ = 21000022297 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21000022343) 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, 51818 + ... + 211388.

It is an arithmetic number, because the mean of its divisors is an integer number (2653044072).

Almost surely, 2^21000022313 is an apocalyptic number.

It is an amenable number.

21000022313 is a deficient number, since it is larger than the sum of its proper divisors (224330263).

21000022313 is a wasteful number, since it uses less digits than its factorization.

21000022313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160975.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21000022313 its reverse (31322000012), we get a palindrome (52322022325).

The spelling of 21000022313 in words is "twenty-one billion, twenty-two thousand, three hundred thirteen".