21252241652 has 12 divisors (see below), whose sum is σ = 37224966660. Its totient is φ = 10616536896.

The previous prime is 21252241631. The next prime is 21252241657. The reversal of 21252241652 is 25614225212.

It can be written as a sum of positive squares in 2 ways, for example, as 872966116 + 20379275536 = 29546^2 + 142756^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21252241657) 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, 2390993 + ... + 2399864.

It is an arithmetic number, because the mean of its divisors is an integer number (3102080555).

Almost surely, 2^21252241652 is an apocalyptic number.

It is an amenable number.

21252241652 is a deficient number, since it is larger than the sum of its proper divisors (15972725008).

21252241652 is a wasteful number, since it uses less digits than its factorization.

21252241652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4791970 (or 4791968 counting only the distinct ones).

The product of its digits is 19200, while the sum is 32.

Adding to 21252241652 its reverse (25614225212), we get a palindrome (46866466864).

The spelling of 21252241652 in words is "twenty-one billion, two hundred fifty-two million, two hundred forty-one thousand, six hundred fifty-two".