21527364 has 12 divisors (see below), whose sum is σ = 50230544. Its totient is φ = 7175784.

The previous prime is 21527351. The next prime is 21527393. The reversal of 21527364 is 46372512.

It is a tau number, because it is divible by the number of its divisors (12).

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 3 ways as a sum of consecutive naturals, for example, 896962 + ... + 896985.

Almost surely, 2^21527364 is an apocalyptic number.

It is an amenable number.

21527364 is an abundant number, since it is smaller than the sum of its proper divisors (28703180).

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

21527364 is a wasteful number, since it uses less digits than its factorization.

21527364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1793954 (or 1793952 counting only the distinct ones).

The product of its digits is 10080, while the sum is 30.

The square root of 21527364 is about 4639.7590454678. The cubic root of 21527364 is about 278.1828068035.

Adding to 21527364 its reverse (46372512), we get a palindrome (67899876).

The spelling of 21527364 in words is "twenty-one million, five hundred twenty-seven thousand, three hundred sixty-four".