21113002052 has 12 divisors (see below), whose sum is σ = 36971283216. Its totient is φ = 10549778280.

The previous prime is 21113001991. The next prime is 21113002091. The reversal of 21113002052 is 25020031112.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21113002052.

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 3 ways as a sum of consecutive naturals, for example, 1673618 + ... + 1686185.

It is an arithmetic number, because the mean of its divisors is an integer number (3080940268).

Almost surely, 2^21113002052 is an apocalyptic number.

It is an amenable number.

21113002052 is a deficient number, since it is larger than the sum of its proper divisors (15858281164).

21113002052 is a wasteful number, since it uses less digits than its factorization.

21113002052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3361378 (or 3361376 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

Adding to 21113002052 its reverse (25020031112), we get a palindrome (46133033164).

The spelling of 21113002052 in words is "twenty-one billion, one hundred thirteen million, two thousand, fifty-two".