21469790 has 8 divisors (see below), whose sum is σ = 38645640. Its totient is φ = 8587912.

The previous prime is 21469783. The next prime is 21469807. The reversal of 21469790 is 9796412.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1073480 + ... + 1073499.

It is an arithmetic number, because the mean of its divisors is an integer number (4830705).

Almost surely, 2^21469790 is an apocalyptic number.

21469790 is a deficient number, since it is larger than the sum of its proper divisors (17175850).

21469790 is a wasteful number, since it uses less digits than its factorization.

21469790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2146986.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 21469790 is about 4633.5504745281. The cubic root of 21469790 is about 277.9345894449.

The spelling of 21469790 in words is "twenty-one million, four hundred sixty-nine thousand, seven hundred ninety".