21201112139 has 2 divisors, whose sum is σ = 21201112140. Its totient is φ = 21201112138.

The previous prime is 21201112087. The next prime is 21201112151. The reversal of 21201112139 is 93121110212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21201112139 - 2¹² = 21201108043 is a prime.

It is not a weakly prime, because it can be changed into another prime (21201112169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600556069 + 10600556070.

It is an arithmetic number, because the mean of its divisors is an integer number (10600556070).

Almost surely, 2^21201112139 is an apocalyptic number.

21201112139 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201112139 is an equidigital number, since it uses as much as digits as its factorization.

21201112139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 23.

The spelling of 21201112139 in words is "twenty-one billion, two hundred one million, one hundred twelve thousand, one hundred thirty-nine".