21348502139 has 4 divisors (see below), whose sum is σ = 21354398256. Its totient is φ = 21342606024.

The previous prime is 21348502117. The next prime is 21348502141. The reversal of 21348502139 is 93120584312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21348502139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21348502169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2942624 + ... + 2949869.

It is an arithmetic number, because the mean of its divisors is an integer number (5338599564).

Almost surely, 2^21348502139 is an apocalyptic number.

21348502139 is a deficient number, since it is larger than the sum of its proper divisors (5896117).

21348502139 is an equidigital number, since it uses as much as digits as its factorization.

21348502139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5896116.

The product of its (nonzero) digits is 51840, while the sum is 38.

The spelling of 21348502139 in words is "twenty-one billion, three hundred forty-eight million, five hundred two thousand, one hundred thirty-nine".