21010250252 has 48 divisors (see below), whose sum is σ = 38724292320. Its totient is φ = 9959846400.

The previous prime is 21010250227. The next prime is 21010250297. The reversal of 21010250252 is 25205201012.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4887368 + ... + 4891664.

It is an arithmetic number, because the mean of its divisors is an integer number (806756090).

Almost surely, 2^21010250252 is an apocalyptic number.

It is an amenable number.

21010250252 is a deficient number, since it is larger than the sum of its proper divisors (17714042068).

21010250252 is a wasteful number, since it uses less digits than its factorization.

21010250252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5082 (or 5080 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

Adding to 21010250252 its reverse (25205201012), we get a palindrome (46215451264).

The spelling of 21010250252 in words is "twenty-one billion, ten million, two hundred fifty thousand, two hundred fifty-two".