190021 has 8 divisors (see below), whose sum is σ = 209664. Its totient is φ = 171120.

The previous prime is 189997. The next prime is 190027. The reversal of 190021 is 120091.

190021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 190021 - 2⁵ = 189989 is a prime.

It is a super-2 number, since 2×190021² = 72215960882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 189983 and 190010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190027) 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, 456 + ... + 766.

It is an arithmetic number, because the mean of its divisors is an integer number (26208).

2¹⁹⁰⁰²¹ is an apocalyptic number.

It is an amenable number.

190021 is a deficient number, since it is larger than the sum of its proper divisors (19643).

190021 is a wasteful number, since it uses less digits than its factorization.

190021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 190021 is about 435.9139823406. The cubic root of 190021 is about 57.4910887261.

The spelling of 190021 in words is "one hundred ninety thousand, twenty-one".