19621046513 has 2 divisors, whose sum is σ = 19621046514. Its totient is φ = 19621046512.

The previous prime is 19621046479. The next prime is 19621046539. The reversal of 19621046513 is 31564012691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15899192464 + 3721854049 = 126092^2 + 61007^2 .

It is a cyclic number.

It is not a de Polignac number, because 19621046513 - 2⁸ = 19621046257 is a prime.

It is not a weakly prime, because it can be changed into another prime (19621040513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9810523256 + 9810523257.

It is an arithmetic number, because the mean of its divisors is an integer number (9810523257).

Almost surely, 2^19621046513 is an apocalyptic number.

It is an amenable number.

19621046513 is a deficient number, since it is larger than the sum of its proper divisors (1).

19621046513 is an equidigital number, since it uses as much as digits as its factorization.

19621046513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 38.

The spelling of 19621046513 in words is "nineteen billion, six hundred twenty-one million, forty-six thousand, five hundred thirteen".