21473190 has 24 divisors (see below), whose sum is σ = 55830528. Its totient is φ = 5726160.

The previous prime is 21473171. The next prime is 21473201. The reversal of 21473190 is 9137412.

21473190 is a `hidden beast` number, since 2 + 1 + 473 + 190 = 666.

It is a super-2 number, since 2×21473190² = 922195777552200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 119206 + ... + 119385.

It is an arithmetic number, because the mean of its divisors is an integer number (2326272).

Almost surely, 2^21473190 is an apocalyptic number.

21473190 is an abundant number, since it is smaller than the sum of its proper divisors (34357338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21473190 is a wasteful number, since it uses less digits than its factorization.

21473190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238604 (or 238601 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 21473190 is about 4633.9173492845. The cubic root of 21473190 is about 277.9492601011.

The spelling of 21473190 in words is "twenty-one million, four hundred seventy-three thousand, one hundred ninety".