21490030139 has 2 divisors, whose sum is σ = 21490030140. Its totient is φ = 21490030138.

The previous prime is 21490030129. The next prime is 21490030153. The reversal of 21490030139 is 93103009412.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21490030139 is a prime.

It is not a weakly prime, because it can be changed into another prime (21490030129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10745015069 + 10745015070.

It is an arithmetic number, because the mean of its divisors is an integer number (10745015070).

Almost surely, 2^21490030139 is an apocalyptic number.

21490030139 is a deficient number, since it is larger than the sum of its proper divisors (1).

21490030139 is an equidigital number, since it uses as much as digits as its factorization.

21490030139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 32.

The spelling of 21490030139 in words is "twenty-one billion, four hundred ninety million, thirty thousand, one hundred thirty-nine".