100197921 has 8 divisors (see below), whose sum is σ = 137906944. Its totient is φ = 64643760.

The previous prime is 100197907. The next prime is 100197941. The reversal of 100197921 is 129791001.

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

It is not a de Polignac number, because 100197921 - 2⁶ = 100197857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100197941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 538606 + ... + 538791.

It is an arithmetic number, because the mean of its divisors is an integer number (17238368).

Almost surely, 2^100197921 is an apocalyptic number.

It is an amenable number.

100197921 is a deficient number, since it is larger than the sum of its proper divisors (37709023).

100197921 is a wasteful number, since it uses less digits than its factorization.

100197921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077431.

The product of its (nonzero) digits is 1134, while the sum is 30.

The square root of 100197921 is about 10009.8911582494. The cubic root of 100197921 is about 464.4649041913.

The spelling of 100197921 in words is "one hundred million, one hundred ninety-seven thousand, nine hundred twenty-one".