21994245113 has 4 divisors (see below), whose sum is σ = 21994561908. Its totient is φ = 21993928320.

The previous prime is 21994245089. The next prime is 21994245137. The reversal of 21994245113 is 31154249912.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (21994245089) and next prime (21994245137).

It can be written as a sum of positive squares in 2 ways, for example, as 20987896384 + 1006348729 = 144872^2 + 31723^2 .

It is a cyclic number.

It is not a de Polignac number, because 21994245113 - 2¹⁶ = 21994179577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21994235113) 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, 4256 + ... + 209777.

It is an arithmetic number, because the mean of its divisors is an integer number (5498640477).

Almost surely, 2^21994245113 is an apocalyptic number.

It is an amenable number.

21994245113 is a deficient number, since it is larger than the sum of its proper divisors (316795).

21994245113 is a wasteful number, since it uses less digits than its factorization.

21994245113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316794.

The product of its digits is 77760, while the sum is 41.

The spelling of 21994245113 in words is "twenty-one billion, nine hundred ninety-four million, two hundred forty-five thousand, one hundred thirteen".