2221973281 has 4 divisors (see below), whose sum is σ = 2423970864. Its totient is φ = 2019975700.

The previous prime is 2221973279. The next prime is 2221973291. The reversal of 2221973281 is 1823791222.

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 2221973281 - 2¹ = 2221973279 is a prime.

It is a super-2 number, since 2×2221973281² = 9874330522955809922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2221973281.

It is not an unprimeable number, because it can be changed into a prime (2221973291) 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 3 ways as a sum of consecutive naturals, for example, 100998775 + ... + 100998796.

It is an arithmetic number, because the mean of its divisors is an integer number (605992716).

Almost surely, 2^2221973281 is an apocalyptic number.

It is an amenable number.

2221973281 is a deficient number, since it is larger than the sum of its proper divisors (201997583).

2221973281 is a wasteful number, since it uses less digits than its factorization.

2221973281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201997582.

The product of its digits is 24192, while the sum is 37.

The square root of 2221973281 is about 47137.8115847565. The cubic root of 2221973281 is about 1304.9071499732.

The spelling of 2221973281 in words is "two billion, two hundred twenty-one million, nine hundred seventy-three thousand, two hundred eighty-one".