100566921 has 32 divisors (see below), whose sum is σ = 167157760. Its totient is φ = 52363584.

The previous prime is 100566919. The next prime is 100566929. The reversal of 100566921 is 129665001.

It is not a de Polignac number, because 100566921 - 2¹ = 100566919 is a prime.

It is a super-2 number, since 2×100566921² = 20227411198840482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (100566929) 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, 19236 + ... + 23898.

It is an arithmetic number, because the mean of its divisors is an integer number (5223680).

Almost surely, 2^100566921 is an apocalyptic number.

It is an amenable number.

100566921 is a deficient number, since it is larger than the sum of its proper divisors (66590839).

100566921 is a wasteful number, since it uses less digits than its factorization.

100566921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4765.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 100566921 is about 10028.3059885506. The cubic root of 100566921 is about 465.0343690633.

The spelling of 100566921 in words is "one hundred million, five hundred sixty-six thousand, nine hundred twenty-one".