207090921 has 8 divisors (see below), whose sum is σ = 276727264. Its totient is φ = 137757600.

The previous prime is 207090911. The next prime is 207090941. The reversal of 207090921 is 129090702.

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

It is not a de Polignac number, because 207090921 - 2¹⁷ = 206959849 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (207090901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74155 + ... + 76896.

It is an arithmetic number, because the mean of its divisors is an integer number (34590908).

Almost surely, 2^207090921 is an apocalyptic number.

It is an amenable number.

207090921 is a deficient number, since it is larger than the sum of its proper divisors (69636343).

207090921 is a wasteful number, since it uses less digits than its factorization.

207090921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151511.

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 207090921 is about 14390.6539462250. The cubic root of 207090921 is about 591.6347662318.

The spelling of 207090921 in words is "two hundred seven million, ninety thousand, nine hundred twenty-one".