100821961879 has 2 divisors, whose sum is σ = 100821961880. Its totient is φ = 100821961878.

The previous prime is 100821961861. The next prime is 100821961951. The reversal of 100821961879 is 978169128001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 100821961879 - 2⁵ = 100821961847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100821961859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50410980939 + 50410980940.

It is an arithmetic number, because the mean of its divisors is an integer number (50410980940).

Almost surely, 2^100821961879 is an apocalyptic number.

100821961879 is a deficient number, since it is larger than the sum of its proper divisors (1).

100821961879 is an equidigital number, since it uses as much as digits as its factorization.

100821961879 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 52.

The spelling of 100821961879 in words is "one hundred billion, eight hundred twenty-one million, nine hundred sixty-one thousand, eight hundred seventy-nine".