16961862221 has 4 divisors (see below), whose sum is σ = 17194216572. Its totient is φ = 16729507872.

The previous prime is 16961862209. The next prime is 16961862227. The reversal of 16961862221 is 12226816961.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8385064900 + 8576797321 = 91570^2 + 92611^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16961862221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16961862227) 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, 116177066 + ... + 116177211.

It is an arithmetic number, because the mean of its divisors is an integer number (4298554143).

Almost surely, 2^16961862221 is an apocalyptic number.

It is an amenable number.

16961862221 is a deficient number, since it is larger than the sum of its proper divisors (232354351).

16961862221 is an equidigital number, since it uses as much as digits as its factorization.

16961862221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232354350.

The product of its digits is 124416, while the sum is 44.

The spelling of 16961862221 in words is "sixteen billion, nine hundred sixty-one million, eight hundred sixty-two thousand, two hundred twenty-one".