21473496 has 96 divisors (see below), whose sum is σ = 66830400. Its totient is φ = 6160320.

The previous prime is 21473489. The next prime is 21473497. The reversal of 21473496 is 69437412.

It is a super-2 number, since 2×21473496² = 922222060924032, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21473496.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21473497) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14335 + ... + 15761.

It is an arithmetic number, because the mean of its divisors is an integer number (696150).

Almost surely, 2^21473496 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21473496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33415200).

21473496 is an abundant number, since it is smaller than the sum of its proper divisors (45356904).

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

21473496 is a wasteful number, since it uses less digits than its factorization.

21473496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1469 (or 1462 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 21473496 is about 4633.9503665879. The cubic root of 21473496 is about 277.9505803842.

The spelling of 21473496 in words is "twenty-one million, four hundred seventy-three thousand, four hundred ninety-six".