2221999971 has 8 divisors (see below), whose sum is σ = 2977555200. Its totient is φ = 1473889032.

The previous prime is 2221999951. The next prime is 2222000029. The reversal of 2221999971 is 1799991222.

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

It is not a de Polignac number, because 2221999971 - 2²¹ = 2219902819 is a prime.

It is a super-2 number, since 2×2221999971² = 9874567742248001682, which contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (2221999921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1860375 + ... + 1861568.

It is an arithmetic number, because the mean of its divisors is an integer number (372194400).

Almost surely, 2^2221999971 is an apocalyptic number.

2221999971 is a deficient number, since it is larger than the sum of its proper divisors (755555229).

2221999971 is a wasteful number, since it uses less digits than its factorization.

2221999971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3722145.

The product of its digits is 367416, while the sum is 51.

The square root of 2221999971 is about 47138.0946899639. The cubic root of 2221999971 is about 1304.9123747333.

The spelling of 2221999971 in words is "two billion, two hundred twenty-one million, nine hundred ninety-nine thousand, nine hundred seventy-one".