21430606 has 8 divisors (see below), whose sum is σ = 32256504. Its totient is φ = 10678440.

The previous prime is 21430597. The next prime is 21430621. The reversal of 21430606 is 60603412.

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, 17700 + ... + 18871.

It is an arithmetic number, because the mean of its divisors is an integer number (4032063).

Almost surely, 2^21430606 is an apocalyptic number.

21430606 is a deficient number, since it is larger than the sum of its proper divisors (10825898).

21430606 is a wasteful number, since it uses less digits than its factorization.

21430606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36866.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 21430606 is about 4629.3202524777. The cubic root of 21430606 is about 277.7654025539.

The spelling of 21430606 in words is "twenty-one million, four hundred thirty thousand, six hundred six".