21052964 has 6 divisors (see below), whose sum is σ = 36842694. Its totient is φ = 10526480.

The previous prime is 21052957. The next prime is 21052973. The reversal of 21052964 is 46925012.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20702500 + 350464 = 4550^2 + 592^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2631617 + ... + 2631624.

It is an arithmetic number, because the mean of its divisors is an integer number (6140449).

Almost surely, 2^21052964 is an apocalyptic number.

It is an amenable number.

21052964 is a deficient number, since it is larger than the sum of its proper divisors (15789730).

21052964 is a wasteful number, since it uses less digits than its factorization.

21052964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5263245 (or 5263243 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 21052964 is about 4588.3509020126. The cubic root of 21052964 is about 276.1241652349.

Adding to 21052964 its reverse (46925012), we get a palindrome (67977976).

The spelling of 21052964 in words is "twenty-one million, fifty-two thousand, nine hundred sixty-four".