21088052 has 6 divisors (see below), whose sum is σ = 36904098. Its totient is φ = 10544024.

The previous prime is 21088013. The next prime is 21088057. The reversal of 21088052 is 25088012.

It can be written as a sum of positive squares in only one way, i.e., 18011536 + 3076516 = 4244^2 + 1754^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21088057) by changing a digit.

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 as a sum of consecutive naturals, namely, 2636003 + ... + 2636010.

It is an arithmetic number, because the mean of its divisors is an integer number (6150683).

Almost surely, 2^21088052 is an apocalyptic number.

It is an amenable number.

21088052 is a deficient number, since it is larger than the sum of its proper divisors (15816046).

21088052 is a wasteful number, since it uses less digits than its factorization.

21088052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5272017 (or 5272015 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 21088052 is about 4592.1729061524. The cubic root of 21088052 is about 276.2774812106.

The spelling of 21088052 in words is "twenty-one million, eighty-eight thousand, fifty-two".