21473084 has 12 divisors (see below), whose sum is σ = 37965984. Its totient is φ = 10625664.

The previous prime is 21473071. The next prime is 21473087. The reversal of 21473084 is 48037412.

It is a super-2 number, since 2×21473084² = 922186672942112, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21473087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27284 + ... + 28059.

It is an arithmetic number, because the mean of its divisors is an integer number (3163832).

Almost surely, 2^21473084 is an apocalyptic number.

It is an amenable number.

21473084 is a deficient number, since it is larger than the sum of its proper divisors (16492900).

21473084 is a wasteful number, since it uses less digits than its factorization.

21473084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55444 (or 55442 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 21473084 is about 4633.9059118631. The cubic root of 21473084 is about 277.9488027452.

The spelling of 21473084 in words is "twenty-one million, four hundred seventy-three thousand, eighty-four".