21236002252 has 12 divisors (see below), whose sum is σ = 37223240040. Its totient is φ = 10600790816.

The previous prime is 21236002243. The next prime is 21236002253. The reversal of 21236002252 is 25220063212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21236002253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4299802 + ... + 4304737.

It is an arithmetic number, because the mean of its divisors is an integer number (3101936670).

Almost surely, 2^21236002252 is an apocalyptic number.

It is an amenable number.

21236002252 is a deficient number, since it is larger than the sum of its proper divisors (15987237788).

21236002252 is a wasteful number, since it uses less digits than its factorization.

21236002252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8605160 (or 8605158 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 21236002252 its reverse (25220063212), we get a palindrome (46456065464).

The spelling of 21236002252 in words is "twenty-one billion, two hundred thirty-six million, two thousand, two hundred fifty-two".