21240132139 has 2 divisors, whose sum is σ = 21240132140. Its totient is φ = 21240132138.

The previous prime is 21240132113. The next prime is 21240132187. The reversal of 21240132139 is 93123104212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21240132139 - 2²⁷ = 21105914411 is a prime.

It is a super-2 number, since 2×21240132139² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21240130139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10620066069 + 10620066070.

It is an arithmetic number, because the mean of its divisors is an integer number (10620066070).

Almost surely, 2^21240132139 is an apocalyptic number.

21240132139 is a deficient number, since it is larger than the sum of its proper divisors (1).

21240132139 is an equidigital number, since it uses as much as digits as its factorization.

21240132139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The spelling of 21240132139 in words is "twenty-one billion, two hundred forty million, one hundred thirty-two thousand, one hundred thirty-nine".