21201322139 has 2 divisors, whose sum is σ = 21201322140. Its totient is φ = 21201322138.

The previous prime is 21201322111. The next prime is 21201322151. The reversal of 21201322139 is 93122310212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21201322139 - 2¹² = 21201318043 is a prime.

It is not a weakly prime, because it can be changed into another prime (21201322739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600661069 + 10600661070.

It is an arithmetic number, because the mean of its divisors is an integer number (10600661070).

Almost surely, 2^21201322139 is an apocalyptic number.

21201322139 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201322139 is an equidigital number, since it uses as much as digits as its factorization.

21201322139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The spelling of 21201322139 in words is "twenty-one billion, two hundred one million, three hundred twenty-two thousand, one hundred thirty-nine".