21052190 has 32 divisors (see below), whose sum is σ = 40176000. Its totient is φ = 7920288.

The previous prime is 21052177. The next prime is 21052217. The reversal of 21052190 is 9125012.

It is a super-3 number, since 3×21052190³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33701 + ... + 34319.

It is an arithmetic number, because the mean of its divisors is an integer number (1255500).

Almost surely, 2^21052190 is an apocalyptic number.

21052190 is a deficient number, since it is larger than the sum of its proper divisors (19123810).

21052190 is a wasteful number, since it uses less digits than its factorization.

21052190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 21052190 is about 4588.2665572087. The cubic root of 21052190 is about 276.1207813452.

The spelling of 21052190 in words is "twenty-one million, fifty-two thousand, one hundred ninety".