21345190 has 8 divisors (see below), whose sum is σ = 38421360. Its totient is φ = 8538072.

The previous prime is 21345187. The next prime is 21345211. The reversal of 21345190 is 9154312.

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

It is a super-2 number, since 2×21345190² = 911234272272200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1067250 + ... + 1067269.

It is an arithmetic number, because the mean of its divisors is an integer number (4802670).

Almost surely, 2^21345190 is an apocalyptic number.

21345190 is a deficient number, since it is larger than the sum of its proper divisors (17076170).

21345190 is a wasteful number, since it uses less digits than its factorization.

21345190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2134526.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 21345190 is about 4620.0854970444. The cubic root of 21345190 is about 277.3958811838.

The spelling of 21345190 in words is "twenty-one million, three hundred forty-five thousand, one hundred ninety".