21343790 has 16 divisors (see below), whose sum is σ = 41374368. Its totient is φ = 7880736.

The previous prime is 21343787. The next prime is 21343801. The reversal of 21343790 is 9734312.

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 7 ways as a sum of consecutive naturals, for example, 81962 + ... + 82221.

It is an arithmetic number, because the mean of its divisors is an integer number (2585898).

Almost surely, 2^21343790 is an apocalyptic number.

21343790 is a deficient number, since it is larger than the sum of its proper divisors (20030578).

21343790 is a wasteful number, since it uses less digits than its factorization.

21343790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164203.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 21343790 is about 4619.9339822123. The cubic root of 21343790 is about 277.3898163869.

The spelling of 21343790 in words is "twenty-one million, three hundred forty-three thousand, seven hundred ninety".