2697984221 has 4 divisors (see below), whose sum is σ = 2732136000. Its totient is φ = 2663832444.

The previous prime is 2697984209. The next prime is 2697984229. The reversal of 2697984221 is 1224897962.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1224897962 = 2 ⋅612448981.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2697984221 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2697984221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2697984229) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 17075771 + ... + 17075928.

It is an arithmetic number, because the mean of its divisors is an integer number (683034000).

Almost surely, 2^2697984221 is an apocalyptic number.

It is an amenable number.

2697984221 is a deficient number, since it is larger than the sum of its proper divisors (34151779).

2697984221 is an equidigital number, since it uses as much as digits as its factorization.

2697984221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34151778.

The product of its digits is 870912, while the sum is 50.

The square root of 2697984221 is about 51942.1237628959. The cubic root of 2697984221 is about 1392.1300298351.

The spelling of 2697984221 in words is "two billion, six hundred ninety-seven million, nine hundred eighty-four thousand, two hundred twenty-one".