21502703039 has 2 divisors, whose sum is σ = 21502703040. Its totient is φ = 21502703038.

The previous prime is 21502703029. The next prime is 21502703071. The reversal of 21502703039 is 93030720512.

It is an a-pointer prime, because the next prime (21502703071) can be obtained adding 21502703039 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21502703039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21502702996 and 21502703014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21502703029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10751351519 + 10751351520.

It is an arithmetic number, because the mean of its divisors is an integer number (10751351520).

Almost surely, 2^21502703039 is an apocalyptic number.

21502703039 is a deficient number, since it is larger than the sum of its proper divisors (1).

21502703039 is an equidigital number, since it uses as much as digits as its factorization.

21502703039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11340, while the sum is 32.

The spelling of 21502703039 in words is "twenty-one billion, five hundred two million, seven hundred three thousand, thirty-nine".