21472575 has 12 divisors (see below), whose sum is σ = 35501448. Its totient is φ = 11452000.

The previous prime is 21472571. The next prime is 21472589. The reversal of 21472575 is 57527412.

It is not a de Polignac number, because 21472575 - 2² = 21472571 is a prime.

It is a super-2 number, since 2×21472575² = 922142954261250, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21472571) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 143076 + ... + 143225.

It is an arithmetic number, because the mean of its divisors is an integer number (2958454).

Almost surely, 2^21472575 is an apocalyptic number.

21472575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21472575 is a deficient number, since it is larger than the sum of its proper divisors (14028873).

21472575 is a wasteful number, since it uses less digits than its factorization.

21472575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286314 (or 286309 counting only the distinct ones).

The product of its digits is 19600, while the sum is 33.

The square root of 21472575 is about 4633.8509902672. The cubic root of 21472575 is about 277.9466065530.

Adding to 21472575 its reverse (57527412), we get a palindrome (78999987).

The spelling of 21472575 in words is "twenty-one million, four hundred seventy-two thousand, five hundred seventy-five".