21154232 has 64 divisors (see below), whose sum is σ = 45554400. Its totient is φ = 9123840.

The previous prime is 21154207. The next prime is 21154283. The reversal of 21154232 is 23245112.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 237644 + ... + 237732.

Almost surely, 2^21154232 is an apocalyptic number.

21154232 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 21154232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22777200).

21154232 is an abundant number, since it is smaller than the sum of its proper divisors (24400168).

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

21154232 is a wasteful number, since it uses less digits than its factorization.

21154232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216 (or 212 counting only the distinct ones).

The product of its digits is 480, while the sum is 20.

The square root of 21154232 is about 4599.3730007469. The cubic root of 21154232 is about 276.5661905111.

Adding to 21154232 its reverse (23245112), we get a palindrome (44399344).

The spelling of 21154232 in words is "twenty-one million, one hundred fifty-four thousand, two hundred thirty-two".