21310050031 has 4 divisors (see below), whose sum is σ = 21420464992. Its totient is φ = 21199635072.

The previous prime is 21310050011. The next prime is 21310050049. The reversal of 21310050031 is 13005001312.

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 21310050031 - 2¹⁵ = 21310017263 is a prime.

It is a super-2 number, since 2×21310050031² (a number of 21 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 = 21310049987 and 21310050014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310050011) 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, 55207191 + ... + 55207576.

It is an arithmetic number, because the mean of its divisors is an integer number (5355116248).

Almost surely, 2^21310050031 is an apocalyptic number.

21310050031 is a deficient number, since it is larger than the sum of its proper divisors (110414961).

21310050031 is a wasteful number, since it uses less digits than its factorization.

21310050031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110414960.

The product of its (nonzero) digits is 90, while the sum is 16.

Adding to 21310050031 its reverse (13005001312), we get a palindrome (34315051343).

The spelling of 21310050031 in words is "twenty-one billion, three hundred ten million, fifty thousand, thirty-one".