2221011997 has 8 divisors (see below), whose sum is σ = 2321827776. Its totient is φ = 2120550432.

The previous prime is 2221011983. The next prime is 2221012033. The reversal of 2221011997 is 7991101222.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2221011997 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 (2221011907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75688 + ... + 100849.

It is an arithmetic number, because the mean of its divisors is an integer number (290228472).

Almost surely, 2^2221011997 is an apocalyptic number.

It is an amenable number.

2221011997 is a deficient number, since it is larger than the sum of its proper divisors (100815779).

2221011997 is a wasteful number, since it uses less digits than its factorization.

2221011997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177107.

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 2221011997 is about 47127.6139540291. The cubic root of 2221011997 is about 1304.7189437944.

The spelling of 2221011997 in words is "two billion, two hundred twenty-one million, eleven thousand, nine hundred ninety-seven".