2199227921 has 4 divisors (see below), whose sum is σ = 2399157744. Its totient is φ = 1999298100.

The previous prime is 2199227917. The next prime is 2199227929. The reversal of 2199227921 is 1297229912.

It is a happy number.

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 2199227921 - 2² = 2199227917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2199227929) 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, 99964895 + ... + 99964916.

It is an arithmetic number, because the mean of its divisors is an integer number (599789436).

Almost surely, 2^2199227921 is an apocalyptic number.

It is an amenable number.

2199227921 is a deficient number, since it is larger than the sum of its proper divisors (199929823).

2199227921 is a wasteful number, since it uses less digits than its factorization.

2199227921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199929822.

The product of its digits is 81648, while the sum is 44.

The square root of 2199227921 is about 46895.9264862099. The cubic root of 2199227921 is about 1300.4392836946.

The spelling of 2199227921 in words is "two billion, one hundred ninety-nine million, two hundred twenty-seven thousand, nine hundred twenty-one".