21450670 has 8 divisors (see below), whose sum is σ = 38611224. Its totient is φ = 8580264.

The previous prime is 21450661. The next prime is 21450701. The reversal of 21450670 is 7605412.

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, 1072524 + ... + 1072543.

It is an arithmetic number, because the mean of its divisors is an integer number (4826403).

Almost surely, 2^21450670 is an apocalyptic number.

21450670 is a deficient number, since it is larger than the sum of its proper divisors (17160554).

21450670 is a wasteful number, since it uses less digits than its factorization.

21450670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2145074.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 21450670 is about 4631.4868023131. The cubic root of 21450670 is about 277.8520597193.

The spelling of 21450670 in words is "twenty-one million, four hundred fifty thousand, six hundred seventy".