100209021 has 32 divisors (see below), whose sum is σ = 154452480. Its totient is φ = 57153600.

The previous prime is 100209017. The next prime is 100209073. The reversal of 100209021 is 120902001.

It is a happy number.

It is not a de Polignac number, because 100209021 - 2² = 100209017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100209001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 113046 + ... + 113928.

It is an arithmetic number, because the mean of its divisors is an integer number (4826640).

Almost surely, 2^100209021 is an apocalyptic number.

100209021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

100209021 is a deficient number, since it is larger than the sum of its proper divisors (54243459).

100209021 is a wasteful number, since it uses less digits than its factorization.

100209021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 100209021 is about 10010.4455944778. The cubic root of 100209021 is about 464.4820548136.

The spelling of 100209021 in words is "one hundred million, two hundred nine thousand, twenty-one".