21321303031 has 4 divisors (see below), whose sum is σ = 24367203472. Its totient is φ = 18275402592.

The previous prime is 21321303019. The next prime is 21321303043. The reversal of 21321303031 is 13030312312.

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

It is an interprime number because it is at equal distance from previous prime (21321303019) and next prime (21321303043).

It is a cyclic number.

It is not a de Polignac number, because 21321303031 - 2¹⁷ = 21321171959 is a prime.

It is a super-2 number, since 2×21321303031² (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 (21321303011) 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, 1522950210 + ... + 1522950223.

It is an arithmetic number, because the mean of its divisors is an integer number (6091800868).

Almost surely, 2^21321303031 is an apocalyptic number.

21321303031 is a deficient number, since it is larger than the sum of its proper divisors (3045900441).

21321303031 is an equidigital number, since it uses as much as digits as its factorization.

21321303031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3045900440.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21321303031 its reverse (13030312312), we get a palindrome (34351615343).

The spelling of 21321303031 in words is "twenty-one billion, three hundred twenty-one million, three hundred three thousand, thirty-one".