21473701 has 8 divisors (see below), whose sum is σ = 22075520. Its totient is φ = 20880288.

The previous prime is 21473671. The next prime is 21473707. The reversal of 21473701 is 10737412.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21473701 is a prime.

It is a super-2 number, since 2×21473701² = 922239669274802, 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 (21473707) 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, 3265 + ... + 7321.

It is an arithmetic number, because the mean of its divisors is an integer number (2759440).

Almost surely, 2^21473701 is an apocalyptic number.

It is an amenable number.

21473701 is a deficient number, since it is larger than the sum of its proper divisors (601819).

21473701 is an equidigital number, since it uses as much as digits as its factorization.

21473701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4203.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 21473701 is about 4633.9724858916. The cubic root of 21473701 is about 277.9514648806.

The spelling of 21473701 in words is "twenty-one million, four hundred seventy-three thousand, seven hundred one".