21993517013 has 8 divisors (see below), whose sum is σ = 24931922400. Its totient is φ = 19233196848.

The previous prime is 21993517003. The next prime is 21993517027. The reversal of 21993517013 is 31071539912.

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 21993517013 - 2⁴ = 21993516997 is a prime.

It is a super-2 number, since 2×21993517013² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21993517003) 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, 44521043 + ... + 44521536.

It is an arithmetic number, because the mean of its divisors is an integer number (3116490300).

Almost surely, 2^21993517013 is an apocalyptic number.

It is an amenable number.

21993517013 is a deficient number, since it is larger than the sum of its proper divisors (2938405387).

21993517013 is a wasteful number, since it uses less digits than its factorization.

21993517013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89042611.

The product of its (nonzero) digits is 51030, while the sum is 41.

The spelling of 21993517013 in words is "twenty-one billion, nine hundred ninety-three million, five hundred seventeen thousand, thirteen".