21473152 has 16 divisors (see below), whose sum is σ = 42778800. Its totient is φ = 10736512.

The previous prime is 21473147. The next prime is 21473171. The reversal of 21473152 is 25137412.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×21473152² = 922192513630208, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83752 + ... + 84007.

It is an arithmetic number, because the mean of its divisors is an integer number (2673675).

Almost surely, 2^21473152 is an apocalyptic number.

It is an amenable number.

21473152 is a deficient number, since it is larger than the sum of its proper divisors (21305648).

21473152 is an equidigital number, since it uses as much as digits as its factorization.

21473152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167773 (or 167761 counting only the distinct ones).

The product of its digits is 1680, while the sum is 25.

The square root of 21473152 is about 4633.9132490801. The cubic root of 21473152 is about 277.9490961435.

The spelling of 21473152 in words is "twenty-one million, four hundred seventy-three thousand, one hundred fifty-two".