21473406 has 12 divisors (see below), whose sum is σ = 46525752. Its totient is φ = 7157796.

The previous prime is 21473393. The next prime is 21473423. The reversal of 21473406 is 60437412.

It is a super-2 number, since 2×21473406² = 922214330481672, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21473406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 596466 + ... + 596501.

It is an arithmetic number, because the mean of its divisors is an integer number (3877146).

Almost surely, 2^21473406 is an apocalyptic number.

21473406 is an abundant number, since it is smaller than the sum of its proper divisors (25052346).

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

21473406 is a wasteful number, since it uses less digits than its factorization.

21473406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192975 (or 1192972 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 21473406 is about 4633.9406556407. The cubic root of 21473406 is about 277.9501920670.

The spelling of 21473406 in words is "twenty-one million, four hundred seventy-three thousand, four hundred six".