21473045 has 8 divisors (see below), whose sum is σ = 28110240. Its totient is φ = 15616720.

The previous prime is 21473041. The next prime is 21473071. The reversal of 21473045 is 54037412.

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

It is not a de Polignac number, because 21473045 - 2² = 21473041 is a prime.

It is a super-2 number, since 2×21473045² = 922183323144050, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21473041) 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, 195155 + ... + 195264.

It is an arithmetic number, because the mean of its divisors is an integer number (3513780).

Almost surely, 2^21473045 is an apocalyptic number.

It is an amenable number.

21473045 is a deficient number, since it is larger than the sum of its proper divisors (6637195).

21473045 is a wasteful number, since it uses less digits than its factorization.

21473045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390435.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 21473045 is about 4633.9017037481. The cubic root of 21473045 is about 277.9486344724.

The spelling of 21473045 in words is "twenty-one million, four hundred seventy-three thousand, forty-five".