21095552 has 16 divisors (see below), whose sum is σ = 42026550. Its totient is φ = 10547712.

The previous prime is 21095551. The next prime is 21095561. The reversal of 21095552 is 25559012.

It can be written as a sum of positive squares in only one way, i.e., 11999296 + 9096256 = 3464^2 + 3016^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is not an unprimeable number, because it can be changed into a prime (21095551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82277 + ... + 82532.

Almost surely, 2^21095552 is an apocalyptic number.

It is an amenable number.

21095552 is a deficient number, since it is larger than the sum of its proper divisors (20930998).

21095552 is an equidigital number, since it uses as much as digits as its factorization.

21095552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164823 (or 164811 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 21095552 is about 4592.9894404407. The cubic root of 21095552 is about 276.3102301737.

The spelling of 21095552 in words is "twenty-one million, ninety-five thousand, five hundred fifty-two".