21126421139 has 2 divisors, whose sum is σ = 21126421140. Its totient is φ = 21126421138.

The previous prime is 21126421111. The next prime is 21126421159. The reversal of 21126421139 is 93112462112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21126421139 - 2⁸ = 21126420883 is a prime.

It is a super-3 number, since 3×21126421139³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21126421159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10563210569 + 10563210570.

It is an arithmetic number, because the mean of its divisors is an integer number (10563210570).

Almost surely, 2^21126421139 is an apocalyptic number.

21126421139 is a deficient number, since it is larger than the sum of its proper divisors (1).

21126421139 is an equidigital number, since it uses as much as digits as its factorization.

21126421139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 32.

The spelling of 21126421139 in words is "twenty-one billion, one hundred twenty-six million, four hundred twenty-one thousand, one hundred thirty-nine".