21343190 has 48 divisors (see below), whose sum is σ = 43666560. Its totient is φ = 7497600.

The previous prime is 21343187. The next prime is 21343243. The reversal of 21343190 is 9134312.

21343190 = 60² + 61² + ... + 400².

It is a super-2 number, since 2×21343190² = 911063518752200, 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 23 ways as a sum of consecutive naturals, for example, 37226 + ... + 37794.

It is an arithmetic number, because the mean of its divisors is an integer number (909720).

Almost surely, 2^21343190 is an apocalyptic number.

21343190 is an abundant number, since it is smaller than the sum of its proper divisors (22323370).

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

21343190 is a wasteful number, since it uses less digits than its factorization.

21343190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629 (or 618 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 21343190 is about 4619.8690457631. The cubic root of 21343190 is about 277.3872171071.

The spelling of 21343190 in words is "twenty-one million, three hundred forty-three thousand, one hundred ninety".