21613500045031 has 4 divisors (see below), whose sum is σ = 22751052679000. Its totient is φ = 20475947411064.

The previous prime is 21613500045023. The next prime is 21613500045191. The reversal of 21613500045031 is 13054000531612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21613500045031 - 2³ = 21613500045023 is a prime.

It is a super-2 number, since 2×21613500045031² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21613500044984 and 21613500045002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21613590045031) 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, 568776316956 + ... + 568776316993.

It is an arithmetic number, because the mean of its divisors is an integer number (5687763169750).

Almost surely, 2^{21613500045031} is an apocalyptic number.

21613500045031 is a deficient number, since it is larger than the sum of its proper divisors (1137552633969).

21613500045031 is a wasteful number, since it uses less digits than its factorization.

21613500045031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1137552633968.

The product of its (nonzero) digits is 10800, while the sum is 31.

Adding to 21613500045031 its reverse (13054000531612), we get a palindrome (34667500576643).

The spelling of 21613500045031 in words is "twenty-one trillion, six hundred thirteen billion, five hundred million, forty-five thousand, thirty-one".