21362809839 has 24 divisors (see below), whose sum is σ = 33332600448. Its totient is φ = 12134208240.

The previous prime is 21362809813. The next prime is 21362809879. The reversal of 21362809839 is 93890826312.

It is not a de Polignac number, because 21362809839 - 2¹⁹ = 21362285551 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21362809791 and 21362809800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21362809879) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 410557 + ... + 459654.

It is an arithmetic number, because the mean of its divisors is an integer number (1388858352).

Almost surely, 2^21362809839 is an apocalyptic number.

21362809839 is a deficient number, since it is larger than the sum of its proper divisors (11969790609).

21362809839 is a wasteful number, since it uses less digits than its factorization.

21362809839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870395 (or 870388 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 51.

The spelling of 21362809839 in words is "twenty-one billion, three hundred sixty-two million, eight hundred nine thousand, eight hundred thirty-nine".