21320030983 has 4 divisors (see below), whose sum is σ = 21402988560. Its totient is φ = 21237073408.

The previous prime is 21320030981. The next prime is 21320030989. The reversal of 21320030983 is 38903002312.

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 21320030983 - 2¹ = 21320030981 is a prime.

It is a super-2 number, since 2×21320030983² (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 (21320030981) 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, 41478403 + ... + 41478916.

It is an arithmetic number, because the mean of its divisors is an integer number (5350747140).

Almost surely, 2^21320030983 is an apocalyptic number.

21320030983 is a deficient number, since it is larger than the sum of its proper divisors (82957577).

21320030983 is an equidigital number, since it uses as much as digits as its factorization.

21320030983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82957576.

The product of its (nonzero) digits is 7776, while the sum is 31.

The spelling of 21320030983 in words is "twenty-one billion, three hundred twenty million, thirty thousand, nine hundred eighty-three".