21603020039 has 2 divisors, whose sum is σ = 21603020040. Its totient is φ = 21603020038.

The previous prime is 21603019973. The next prime is 21603020051. The reversal of 21603020039 is 93002030612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21603020039 - 2¹² = 21603015943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21603020099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10801510019 + 10801510020.

It is an arithmetic number, because the mean of its divisors is an integer number (10801510020).

Almost surely, 2^21603020039 is an apocalyptic number.

21603020039 is a deficient number, since it is larger than the sum of its proper divisors (1).

21603020039 is an equidigital number, since it uses as much as digits as its factorization.

21603020039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 26.

The spelling of 21603020039 in words is "twenty-one billion, six hundred three million, twenty thousand, thirty-nine".