21675473 has 2 divisors, whose sum is σ = 21675474. Its totient is φ = 21675472.

The previous prime is 21675461. The next prime is 21675491. The reversal of 21675473 is 37457612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18464209 + 3211264 = 4297^2 + 1792^2 .

It is a cyclic number.

It is not a de Polignac number, because 21675473 - 2⁴ = 21675457 is a prime.

It is a super-2 number, since 2×21675473² = 939652259547458, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21645473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10837736 + 10837737.

It is an arithmetic number, because the mean of its divisors is an integer number (10837737).

Almost surely, 2^21675473 is an apocalyptic number.

It is an amenable number.

21675473 is a deficient number, since it is larger than the sum of its proper divisors (1).

21675473 is an equidigital number, since it uses as much as digits as its factorization.

21675473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35280, while the sum is 35.

The square root of 21675473 is about 4655.6925370991. The cubic root of 21675473 is about 278.8193183597.

The spelling of 21675473 in words is "twenty-one million, six hundred seventy-five thousand, four hundred seventy-three".