2291377221 has 64 divisors (see below), whose sum is σ = 3964746240. Its totient is φ = 1280862720.

The previous prime is 2291377213. The next prime is 2291377237. The reversal of 2291377221 is 1227731922.

It is not a de Polignac number, because 2291377221 - 2³ = 2291377213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2291377201) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2685831 + ... + 2686683.

It is an arithmetic number, because the mean of its divisors is an integer number (61949160).

Almost surely, 2^2291377221 is an apocalyptic number.

2291377221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2291377221 is a deficient number, since it is larger than the sum of its proper divisors (1673369019).

2291377221 is a wasteful number, since it uses less digits than its factorization.

2291377221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1163 (or 1157 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 2291377221 is about 47868.3321309611. The cubic root of 2291377221 is about 1318.3544732808.

The spelling of 2291377221 in words is "two billion, two hundred ninety-one million, three hundred seventy-seven thousand, two hundred twenty-one".