21322552 has 8 divisors (see below), whose sum is σ = 39979800. Its totient is φ = 10661272.

The previous prime is 21322547. The next prime is 21322571. The reversal of 21322552 is 25522312.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1332652 + ... + 1332667.

It is an arithmetic number, because the mean of its divisors is an integer number (4997475).

Almost surely, 2^21322552 is an apocalyptic number.

It is an amenable number.

21322552 is a deficient number, since it is larger than the sum of its proper divisors (18657248).

21322552 is a wasteful number, since it uses less digits than its factorization.

21322552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2665325 (or 2665321 counting only the distinct ones).

The product of its digits is 1200, while the sum is 22.

The square root of 21322552 is about 4617.6348924531. The cubic root of 21322552 is about 277.2977808736.

Adding to 21322552 its reverse (25522312), we get a palindrome (46844864).

The spelling of 21322552 in words is "twenty-one million, three hundred twenty-two thousand, five hundred fifty-two".