21472707 has 8 divisors (see below), whose sum is σ = 28714176. Its totient is φ = 14273192.

The previous prime is 21472699. The next prime is 21472721. The reversal of 21472707 is 70727412.

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 21472707 - 2³ = 21472699 is a prime.

It is a super-2 number, since 2×21472707² = 922154291815698, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (21472727) 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, 9273 + ... + 11354.

It is an arithmetic number, because the mean of its divisors is an integer number (3589272).

Almost surely, 2^21472707 is an apocalyptic number.

21472707 is a deficient number, since it is larger than the sum of its proper divisors (7241469).

21472707 is a wasteful number, since it uses less digits than its factorization.

21472707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20977.

The product of its (nonzero) digits is 5488, while the sum is 30.

The square root of 21472707 is about 4633.8652332583. The cubic root of 21472707 is about 277.9471760993.

The spelling of 21472707 in words is "twenty-one million, four hundred seventy-two thousand, seven hundred seven".