21472807 has 8 divisors (see below), whose sum is σ = 22065120. Its totient is φ = 20883840.

The previous prime is 21472783. The next prime is 21472813. The reversal of 21472807 is 70827412.

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

It is a cyclic number.

It is not a de Polignac number, because 21472807 - 2¹⁵ = 21440039 is a prime.

It is a super-2 number, since 2×21472807² = 922162880918498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21472817) by changing a digit.

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, 17403 + ... + 18595.

It is an arithmetic number, because the mean of its divisors is an integer number (2758140).

Almost surely, 2^21472807 is an apocalyptic number.

21472807 is a deficient number, since it is larger than the sum of its proper divisors (592313).

21472807 is a wasteful number, since it uses less digits than its factorization.

21472807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1673.

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 21472807 is about 4633.8760233740. The cubic root of 21472807 is about 277.9476075723.

The spelling of 21472807 in words is "twenty-one million, four hundred seventy-two thousand, eight hundred seven".