21747473 has 8 divisors (see below), whose sum is σ = 23883456. Its totient is φ = 19638000.

The previous prime is 21747449. The next prime is 21747493. The reversal of 21747473 is 37474712.

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 not a de Polignac number, because 21747473 - 2⁶ = 21747409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21747493) 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, 4886 + ... + 8207.

It is an arithmetic number, because the mean of its divisors is an integer number (2985432).

Almost surely, 2^21747473 is an apocalyptic number.

It is an amenable number.

21747473 is a deficient number, since it is larger than the sum of its proper divisors (2135983).

21747473 is a wasteful number, since it uses less digits than its factorization.

21747473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13255.

The product of its digits is 32928, while the sum is 35.

The square root of 21747473 is about 4663.4185958372. The cubic root of 21747473 is about 279.1276976966.

The spelling of 21747473 in words is "twenty-one million, seven hundred forty-seven thousand, four hundred seventy-three".