21252076 has 12 divisors (see below), whose sum is σ = 37331280. Its totient is φ = 10586000.

The previous prime is 21252059. The next prime is 21252079. The reversal of 21252076 is 67025212.

It is a self number, because there is not a number n which added to its sum of digits gives 21252076.

It is not an unprimeable number, because it can be changed into a prime (21252079) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8800 + ... + 10951.

It is an arithmetic number, because the mean of its divisors is an integer number (3110940).

Almost surely, 2^21252076 is an apocalyptic number.

It is an amenable number.

21252076 is a deficient number, since it is larger than the sum of its proper divisors (16079204).

21252076 is a wasteful number, since it uses less digits than its factorization.

21252076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20024 (or 20022 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 21252076 is about 4609.9973969624. The cubic root of 21252076 is about 276.9919324111.

Adding to 21252076 its reverse (67025212), we get a palindrome (88277288).

The spelling of 21252076 in words is "twenty-one million, two hundred fifty-two thousand, seventy-six".