21455006 has 8 divisors (see below), whose sum is σ = 32209320. Its totient is φ = 10718568.

The previous prime is 21454997. The next prime is 21455011. The reversal of 21455006 is 60055412.

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, 896 + ... + 6611.

It is an arithmetic number, because the mean of its divisors is an integer number (4026165).

Almost surely, 2^21455006 is an apocalyptic number.

21455006 is a deficient number, since it is larger than the sum of its proper divisors (10754314).

21455006 is a wasteful number, since it uses less digits than its factorization.

21455006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8938.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 21455006 is about 4631.9548788821. The cubic root of 21455006 is about 277.8707799638.

The spelling of 21455006 in words is "twenty-one million, four hundred fifty-five thousand, six".