21473076 has 24 divisors (see below), whose sum is σ = 52282944. Its totient is φ = 6846400.

The previous prime is 21473071. The next prime is 21473087. The reversal of 21473076 is 67037412.

It is a super-2 number, since 2×21473076² = 922185985803552, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21473071) 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, 38625 + ... + 39176.

It is an arithmetic number, because the mean of its divisors is an integer number (2178456).

Almost surely, 2^21473076 is an apocalyptic number.

It is an amenable number.

21473076 is an abundant number, since it is smaller than the sum of its proper divisors (30809868).

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

21473076 is a wasteful number, since it uses less digits than its factorization.

21473076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77831 (or 77829 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 30.

The square root of 21473076 is about 4633.9050486604. The cubic root of 21473076 is about 277.9487682277.

The spelling of 21473076 in words is "twenty-one million, four hundred seventy-three thousand, seventy-six".