199265021 has 4 divisors (see below), whose sum is σ = 201238044. Its totient is φ = 197292000.

The previous prime is 199264999. The next prime is 199265023. The reversal of 199265021 is 120562991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 190053796 + 9211225 = 13786^2 + 3035^2 .

It is a cyclic number.

It is not a de Polignac number, because 199265021 - 2⁶ = 199264957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199265023) 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, 986360 + ... + 986561.

It is an arithmetic number, because the mean of its divisors is an integer number (50309511).

Almost surely, 2^199265021 is an apocalyptic number.

It is an amenable number.

199265021 is a deficient number, since it is larger than the sum of its proper divisors (1973023).

199265021 is a wasteful number, since it uses less digits than its factorization.

199265021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1973022.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 199265021 is about 14116.1262745840. The cubic root of 199265021 is about 584.0863044482.

The spelling of 199265021 in words is "one hundred ninety-nine million, two hundred sixty-five thousand, twenty-one".