21475345 has 8 divisors (see below), whose sum is σ = 25879680. Its totient is φ = 17107440.

The previous prime is 21475331. The next prime is 21475357. The reversal of 21475345 is 54357412.

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

It is not a de Polignac number, because 21475345 - 2⁵ = 21475313 is a prime.

It is a super-2 number, since 2×21475345² = 922380885738050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7791 + ... + 10180.

It is an arithmetic number, because the mean of its divisors is an integer number (3234960).

Almost surely, 2^21475345 is an apocalyptic number.

It is an amenable number.

21475345 is a deficient number, since it is larger than the sum of its proper divisors (4404335).

21475345 is a wasteful number, since it uses less digits than its factorization.

21475345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18215.

The product of its digits is 16800, while the sum is 31.

The square root of 21475345 is about 4634.1498680988. The cubic root of 21475345 is about 277.9585579064.

The spelling of 21475345 in words is "twenty-one million, four hundred seventy-five thousand, three hundred forty-five".