100821961946 has 4 divisors (see below), whose sum is σ = 151232942922. Its totient is φ = 50410980972.

The previous prime is 100821961879. The next prime is 100821961951. The reversal of 100821961946 is 649169128001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 96776365921 + 4045596025 = 311089^2 + 63605^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 100821961946.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25205490485 + ... + 25205490488.

Almost surely, 2^100821961946 is an apocalyptic number.

100821961946 is a deficient number, since it is larger than the sum of its proper divisors (50410980976).

100821961946 is an equidigital number, since it uses as much as digits as its factorization.

100821961946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50410980975.

The product of its (nonzero) digits is 186624, while the sum is 47.

The spelling of 100821961946 in words is "one hundred billion, eight hundred twenty-one million, nine hundred sixty-one thousand, nine hundred forty-six".