21525076 has 24 divisors (see below), whose sum is σ = 39390120. Its totient is φ = 10278912.

The previous prime is 21525071. The next prime is 21525089. The reversal of 21525076 is 67052512.

It can be written as a sum of positive squares in 4 ways, for example, as 6625476 + 14899600 = 2574^2 + 3860^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21525071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10296 + ... + 12208.

It is an arithmetic number, because the mean of its divisors is an integer number (1641255).

Almost surely, 2^21525076 is an apocalyptic number.

It is an amenable number.

21525076 is a deficient number, since it is larger than the sum of its proper divisors (17865044).

21525076 is a wasteful number, since it uses less digits than its factorization.

21525076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2043 (or 2041 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 21525076 is about 4639.5124743878. The cubic root of 21525076 is about 278.1729510557.

Adding to 21525076 its reverse (67052512), we get a palindrome (88577588).

The spelling of 21525076 in words is "twenty-one million, five hundred twenty-five thousand, seventy-six".