19962502921 has 2 divisors, whose sum is σ = 19962502922. Its totient is φ = 19962502920.

The previous prime is 19962502873. The next prime is 19962502949. The reversal of 19962502921 is 12920526991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19460250000 + 502252921 = 139500^2 + 22411^2 .

It is a cyclic number.

It is not a de Polignac number, because 19962502921 - 2¹⁵ = 19962470153 is a prime.

It is not a weakly prime, because it can be changed into another prime (19962502991) 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 as a sum of consecutive naturals, namely, 9981251460 + 9981251461.

It is an arithmetic number, because the mean of its divisors is an integer number (9981251461).

Almost surely, 2^19962502921 is an apocalyptic number.

It is an amenable number.

19962502921 is a deficient number, since it is larger than the sum of its proper divisors (1).

19962502921 is an equidigital number, since it uses as much as digits as its factorization.

19962502921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 174960, while the sum is 46.

The spelling of 19962502921 in words is "nineteen billion, nine hundred sixty-two million, five hundred two thousand, nine hundred twenty-one".