100821961945 has 8 divisors (see below), whose sum is σ = 121169949120. Its totient is φ = 80535173040.

The previous prime is 100821961879. The next prime is 100821961951. The reversal of 100821961945 is 549169128001.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 100821961945 - 2⁹ = 100821961433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 100821961895 and 100821961904.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15295941 + ... + 15302530.

It is an arithmetic number, because the mean of its divisors is an integer number (15146243640).

Almost surely, 2^100821961945 is an apocalyptic number.

It is an amenable number.

100821961945 is a deficient number, since it is larger than the sum of its proper divisors (20347987175).

100821961945 is an equidigital number, since it uses as much as digits as its factorization.

100821961945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30599135.

The product of its (nonzero) digits is 155520, while the sum is 46.

The spelling of 100821961945 in words is "one hundred billion, eight hundred twenty-one million, nine hundred sixty-one thousand, nine hundred forty-five".