139689563021 has 2 divisors, whose sum is σ = 139689563022. Its totient is φ = 139689563020.

The previous prime is 139689562889. The next prime is 139689563053. The reversal of 139689563021 is 120365986931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136152882121 + 3536680900 = 368989^2 + 59470^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139689563021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139689503021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69844781510 + 69844781511.

It is an arithmetic number, because the mean of its divisors is an integer number (69844781511).

Almost surely, 2^139689563021 is an apocalyptic number.

It is an amenable number.

139689563021 is a deficient number, since it is larger than the sum of its proper divisors (1).

139689563021 is an equidigital number, since it uses as much as digits as its factorization.

139689563021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2099520, while the sum is 53.

The spelling of 139689563021 in words is "one hundred thirty-nine billion, six hundred eighty-nine million, five hundred sixty-three thousand, twenty-one".