21461532 has 48 divisors (see below), whose sum is σ = 51795744. Its totient is φ = 6912000.

The previous prime is 21461527. The next prime is 21461533. The reversal of 21461532 is 23516412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21461533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88932 + ... + 89172.

It is an arithmetic number, because the mean of its divisors is an integer number (1079078).

Almost surely, 2^21461532 is an apocalyptic number.

It is an amenable number.

21461532 is an abundant number, since it is smaller than the sum of its proper divisors (30334212).

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

21461532 is a wasteful number, since it uses less digits than its factorization.

21461532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470 (or 468 counting only the distinct ones).

The product of its digits is 1440, while the sum is 24.

The square root of 21461532 is about 4632.6592795067. The cubic root of 21461532 is about 277.8989505593.

Adding to 21461532 its reverse (23516412), we get a palindrome (44977944).

The spelling of 21461532 in words is "twenty-one million, four hundred sixty-one thousand, five hundred thirty-two".