21473416 has 8 divisors (see below), whose sum is σ = 40262670. Its totient is φ = 10736704.

The previous prime is 21473393. The next prime is 21473423. The reversal of 21473416 is 61437412.

It can be written as a sum of positive squares in only one way, i.e., 20160100 + 1313316 = 4490^2 + 1146^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×21473416² = 922215189418112, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1342081 + ... + 1342096.

Almost surely, 2^21473416 is an apocalyptic number.

It is an amenable number.

21473416 is a deficient number, since it is larger than the sum of its proper divisors (18789254).

21473416 is a wasteful number, since it uses less digits than its factorization.

21473416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2684183 (or 2684179 counting only the distinct ones).

The product of its digits is 4032, while the sum is 28.

The square root of 21473416 is about 4633.9417346359. The cubic root of 21473416 is about 277.9502352134.

The spelling of 21473416 in words is "twenty-one million, four hundred seventy-three thousand, four hundred sixteen".