21479832 has 96 divisors (see below), whose sum is σ = 65267280. Its totient is φ = 6324480.

The previous prime is 21479779. The next prime is 21479839. The reversal of 21479832 is 23897412.

It is a super-2 number, since 2×21479832² = 922766365496448, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21479839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28938 + ... + 29670.

Almost surely, 2^21479832 is an apocalyptic number.

21479832 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21479832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32633640).

21479832 is an abundant number, since it is smaller than the sum of its proper divisors (43787448).

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

21479832 is a wasteful number, since it uses less digits than its factorization.

21479832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 793 (or 786 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 21479832 is about 4634.6339661294. The cubic root of 21479832 is about 277.9779151926.

The spelling of 21479832 in words is "twenty-one million, four hundred seventy-nine thousand, eight hundred thirty-two".