190180921 has 16 divisors (see below), whose sum is σ = 232187904. Its totient is φ = 152054784.

The previous prime is 190180909. The next prime is 190180957. The reversal of 190180921 is 129081091.

It is not a de Polignac number, because 190180921 - 2⁵ = 190180889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (190180901) 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 15 ways as a sum of consecutive naturals, for example, 6376 + ... + 20518.

It is an arithmetic number, because the mean of its divisors is an integer number (14511744).

Almost surely, 2^190180921 is an apocalyptic number.

It is an amenable number.

190180921 is a deficient number, since it is larger than the sum of its proper divisors (42006983).

190180921 is a wasteful number, since it uses less digits than its factorization.

190180921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14280.

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 190180921 is about 13790.6098849906. The cubic root of 190180921 is about 575.0721230262.

The spelling of 190180921 in words is "one hundred ninety million, one hundred eighty thousand, nine hundred twenty-one".