21473672 has 32 divisors (see below), whose sum is σ = 44150400. Its totient is φ = 9710400.

The previous prime is 21473671. The next prime is 21473707. The reversal of 21473672 is 27637412.

It is a super-2 number, since 2×21473672² = 922237178327168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21473671) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 20522 + ... + 21542.

It is an arithmetic number, because the mean of its divisors is an integer number (1379700).

Almost surely, 2^21473672 is an apocalyptic number.

21473672 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21473672 is an abundant number, since it is smaller than the sum of its proper divisors (22676728).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21473672 is a wasteful number, since it uses less digits than its factorization.

21473672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1277 (or 1273 counting only the distinct ones).

The product of its digits is 14112, while the sum is 32.

The square root of 21473672 is about 4633.9693568257. The cubic root of 21473672 is about 277.9513397571.

The spelling of 21473672 in words is "twenty-one million, four hundred seventy-three thousand, six hundred seventy-two".