2221777997 has 4 divisors (see below), whose sum is σ = 2227832256. Its totient is φ = 2215723740.

The previous prime is 2221777993. The next prime is 2221778003. The reversal of 2221777997 is 7997771222.

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.

It is a cyclic number.

It is not a de Polignac number, because 2221777997 - 2² = 2221777993 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 (2221777993) 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, 3026579 + ... + 3027312.

It is an arithmetic number, because the mean of its divisors is an integer number (556958064).

Almost surely, 2^2221777997 is an apocalyptic number.

It is an amenable number.

2221777997 is a deficient number, since it is larger than the sum of its proper divisors (6054259).

2221777997 is an equidigital number, since it uses as much as digits as its factorization.

2221777997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6054258.

The product of its digits is 1555848, while the sum is 53.

The square root of 2221777997 is about 47135.7401236047. The cubic root of 2221777997 is about 1304.8689204475.

The spelling of 2221777997 in words is "two billion, two hundred twenty-one million, seven hundred seventy-seven thousand, nine hundred ninety-seven".