19221039377 has 2 divisors, whose sum is σ = 19221039378. Its totient is φ = 19221039376.

The previous prime is 19221039373. The next prime is 19221039391. The reversal of 19221039377 is 77393012291.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12158149696 + 7062889681 = 110264^2 + 84041^2 .

It is a cyclic number.

It is not a de Polignac number, because 19221039377 - 2² = 19221039373 is a prime.

It is not a weakly prime, because it can be changed into another prime (19221039371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9610519688 + 9610519689.

It is an arithmetic number, because the mean of its divisors is an integer number (9610519689).

Almost surely, 2^19221039377 is an apocalyptic number.

It is an amenable number.

19221039377 is a deficient number, since it is larger than the sum of its proper divisors (1).

19221039377 is an equidigital number, since it uses as much as digits as its factorization.

19221039377 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 142884, while the sum is 44.

The spelling of 19221039377 in words is "nineteen billion, two hundred twenty-one million, thirty-nine thousand, three hundred seventy-seven".