21310244031 has 8 divisors (see below), whose sum is σ = 28416137904. Its totient is φ = 14205589760.

The previous prime is 21310243961. The next prime is 21310244047. The reversal of 21310244031 is 13044201312.

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 21310244031 - 2²² = 21306049727 is a prime.

It is a super-2 number, since 2×21310244031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21310243989 and 21310244007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310244051) 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, 269016 + ... + 339101.

It is an arithmetic number, because the mean of its divisors is an integer number (3552017238).

Almost surely, 2^21310244031 is an apocalyptic number.

21310244031 is a deficient number, since it is larger than the sum of its proper divisors (7105893873).

21310244031 is a wasteful number, since it uses less digits than its factorization.

21310244031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619801.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21310244031 its reverse (13044201312), we get a palindrome (34354445343).

The spelling of 21310244031 in words is "twenty-one billion, three hundred ten million, two hundred forty-four thousand, thirty-one".