100165021 has 4 divisors (see below), whose sum is σ = 109270944. Its totient is φ = 91059100.

The previous prime is 100165007. The next prime is 100165049. The reversal of 100165021 is 120561001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 100165021 - 2⁷ = 100164893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100164986 and 100165004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100166021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4552945 + ... + 4552966.

It is an arithmetic number, because the mean of its divisors is an integer number (27317736).

Almost surely, 2^100165021 is an apocalyptic number.

100165021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

100165021 is a deficient number, since it is larger than the sum of its proper divisors (9105923).

100165021 is an equidigital number, since it uses as much as digits as its factorization.

100165021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9105922.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 100165021 is about 10008.2476488145. The cubic root of 100165021 is about 464.4140629231.

The spelling of 100165021 in words is "one hundred million, one hundred sixty-five thousand, twenty-one".