21454707 has 4 divisors (see below), whose sum is σ = 28606280. Its totient is φ = 14303136.

The previous prime is 21454687. The next prime is 21454711. The reversal of 21454707 is 70745412.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21454707 - 2¹⁰ = 21453683 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21454747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3575782 + ... + 3575787.

It is an arithmetic number, because the mean of its divisors is an integer number (7151570).

Almost surely, 2^21454707 is an apocalyptic number.

21454707 is a deficient number, since it is larger than the sum of its proper divisors (7151573).

21454707 is an equidigital number, since it uses as much as digits as its factorization.

21454707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7151572.

The product of its (nonzero) digits is 7840, while the sum is 30.

The square root of 21454707 is about 4631.9226029803. The cubic root of 21454707 is about 277.8694891423.

The spelling of 21454707 in words is "twenty-one million, four hundred fifty-four thousand, seven hundred seven".