21113402245 has 16 divisors (see below), whose sum is σ = 27332348400. Its totient is φ = 15564386304.

The previous prime is 21113402239. The next prime is 21113402257. The reversal of 21113402245 is 54220431112.

It can be written as a sum of positive squares in 8 ways, for example, as 1006729441 + 20106672804 = 31729^2 + 141798^2 .

It is a cyclic number.

It is not a de Polignac number, because 21113402245 - 2⁷ = 21113402117 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 243970 + ... + 318979.

It is an arithmetic number, because the mean of its divisors is an integer number (1708271775).

Almost surely, 2^21113402245 is an apocalyptic number.

It is an amenable number.

21113402245 is a deficient number, since it is larger than the sum of its proper divisors (6218946155).

21113402245 is a wasteful number, since it uses less digits than its factorization.

21113402245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563544.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21113402245 its reverse (54220431112), we get a palindrome (75333833357).

The spelling of 21113402245 in words is "twenty-one billion, one hundred thirteen million, four hundred two thousand, two hundred forty-five".