21040024139 has 2 divisors, whose sum is σ = 21040024140. Its totient is φ = 21040024138.

The previous prime is 21040024127. The next prime is 21040024147. The reversal of 21040024139 is 93142004012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21040024139 - 2²⁰ = 21038975563 is a prime.

It is not a weakly prime, because it can be changed into another prime (21040024339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10520012069 + 10520012070.

It is an arithmetic number, because the mean of its divisors is an integer number (10520012070).

Almost surely, 2^21040024139 is an apocalyptic number.

21040024139 is a deficient number, since it is larger than the sum of its proper divisors (1).

21040024139 is an equidigital number, since it uses as much as digits as its factorization.

21040024139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The spelling of 21040024139 in words is "twenty-one billion, forty million, twenty-four thousand, one hundred thirty-nine".