19321100921 has 2 divisors, whose sum is σ = 19321100922. Its totient is φ = 19321100920.

The previous prime is 19321100873. The next prime is 19321100957. The reversal of 19321100921 is 12900112391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14786560000 + 4534540921 = 121600^2 + 67339^2 .

It is a cyclic number.

It is not a de Polignac number, because 19321100921 - 2²² = 19316906617 is a prime.

It is not a weakly prime, because it can be changed into another prime (19321160921) 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, 9660550460 + 9660550461.

It is an arithmetic number, because the mean of its divisors is an integer number (9660550461).

Almost surely, 2^19321100921 is an apocalyptic number.

It is an amenable number.

19321100921 is a deficient number, since it is larger than the sum of its proper divisors (1).

19321100921 is an equidigital number, since it uses as much as digits as its factorization.

19321100921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 29.

The spelling of 19321100921 in words is "nineteen billion, three hundred twenty-one million, one hundred thousand, nine hundred twenty-one".