19357367021 has 2 divisors, whose sum is σ = 19357367022. Its totient is φ = 19357367020.

The previous prime is 19357367017. The next prime is 19357367047. The reversal of 19357367021 is 12076375391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13410798025 + 5946568996 = 115805^2 + 77114^2 .

It is a cyclic number.

It is not a de Polignac number, because 19357367021 - 2² = 19357367017 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19357367011) 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, 9678683510 + 9678683511.

It is an arithmetic number, because the mean of its divisors is an integer number (9678683511).

Almost surely, 2^19357367021 is an apocalyptic number.

It is an amenable number.

19357367021 is a deficient number, since it is larger than the sum of its proper divisors (1).

19357367021 is an equidigital number, since it uses as much as digits as its factorization.

19357367021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 238140, while the sum is 44.

The spelling of 19357367021 in words is "nineteen billion, three hundred fifty-seven million, three hundred sixty-seven thousand, twenty-one".