21133016252 has 6 divisors (see below), whose sum is σ = 36982778448. Its totient is φ = 10566508124.

The previous prime is 21133016249. The next prime is 21133016257. The reversal of 21133016252 is 25261033112.

It is a happy number.

It is a super-2 number, since 2×21133016252² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21133016257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2641627028 + ... + 2641627035.

It is an arithmetic number, because the mean of its divisors is an integer number (6163796408).

Almost surely, 2^21133016252 is an apocalyptic number.

It is an amenable number.

21133016252 is a deficient number, since it is larger than the sum of its proper divisors (15849762196).

21133016252 is a wasteful number, since it uses less digits than its factorization.

21133016252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5283254067 (or 5283254065 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

Adding to 21133016252 its reverse (25261033112), we get a palindrome (46394049364).

The spelling of 21133016252 in words is "twenty-one billion, one hundred thirty-three million, sixteen thousand, two hundred fifty-two".