21700473 has 8 divisors (see below), whose sum is σ = 29016000. Its totient is φ = 14425968.

The previous prime is 21700409. The next prime is 21700493. The reversal of 21700473 is 37400712.

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

It is not a de Polignac number, because 21700473 - 2⁶ = 21700409 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21700493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8998 + ... + 11151.

It is an arithmetic number, because the mean of its divisors is an integer number (3627000).

Almost surely, 2^21700473 is an apocalyptic number.

It is an amenable number.

21700473 is a deficient number, since it is larger than the sum of its proper divisors (7315527).

21700473 is a wasteful number, since it uses less digits than its factorization.

21700473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20511.

The product of its (nonzero) digits is 1176, while the sum is 24.

The square root of 21700473 is about 4658.3766485762. The cubic root of 21700473 is about 278.9264718047.

The spelling of 21700473 in words is "twenty-one million, seven hundred thousand, four hundred seventy-three".