16863282221 has 4 divisors (see below), whose sum is σ = 16868904444. Its totient is φ = 16857660000.

The previous prime is 16863282131. The next prime is 16863282253. The reversal of 16863282221 is 12228236861.

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 12911776900 + 3951505321 = 113630^2 + 62861^2 .

It is a cyclic number.

It is not a de Polignac number, because 16863282221 - 2²⁶ = 16796173357 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 (16863285221) 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, 2806610 + ... + 2812611.

It is an arithmetic number, because the mean of its divisors is an integer number (4217226111).

Almost surely, 2^16863282221 is an apocalyptic number.

It is an amenable number.

16863282221 is a deficient number, since it is larger than the sum of its proper divisors (5622223).

16863282221 is an equidigital number, since it uses as much as digits as its factorization.

16863282221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5622222.

The product of its digits is 110592, while the sum is 41.

The spelling of 16863282221 in words is "sixteen billion, eight hundred sixty-three million, two hundred eighty-two thousand, two hundred twenty-one".