2797691221 has 4 divisors (see below), whose sum is σ = 3012898252. Its totient is φ = 2582484192.

The previous prime is 2797691203. The next prime is 2797691257. The reversal of 2797691221 is 1221967972.

It is a happy number.

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 735168996 + 2062522225 = 27114^2 + 45415^2 .

It is a cyclic number.

It is not a de Polignac number, because 2797691221 - 2⁵ = 2797691189 is a prime.

It is a super-4 number, since 4×2797691221⁴ (a number of 39 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2797691321) 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, 107603496 + ... + 107603521.

It is an arithmetic number, because the mean of its divisors is an integer number (753224563).

Almost surely, 2^2797691221 is an apocalyptic number.

It is an amenable number.

2797691221 is a deficient number, since it is larger than the sum of its proper divisors (215207031).

2797691221 is a wasteful number, since it uses less digits than its factorization.

2797691221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215207030.

The product of its digits is 190512, while the sum is 46.

The square root of 2797691221 is about 52893.2058113327. The cubic root of 2797691221 is about 1409.0722433312.

The spelling of 2797691221 in words is "two billion, seven hundred ninety-seven million, six hundred ninety-one thousand, two hundred twenty-one".