2164221372 has 24 divisors (see below), whose sum is σ = 5315632000. Its totient is φ = 683438256.

The previous prime is 2164221343. The next prime is 2164221373. The reversal of 2164221372 is 2731224612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2164221373) 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, 4745872 + ... + 4746327.

Almost surely, 2^2164221372 is an apocalyptic number.

It is an amenable number.

2164221372 is an abundant number, since it is smaller than the sum of its proper divisors (3151410628).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2164221372 is a wasteful number, since it uses less digits than its factorization.

2164221372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9492225 (or 9492223 counting only the distinct ones).

The product of its digits is 8064, while the sum is 30.

The square root of 2164221372 is about 46521.1927190179. The cubic root of 2164221372 is about 1293.5023651313.

Adding to 2164221372 its reverse (2731224612), we get a palindrome (4895445984).

The spelling of 2164221372 in words is "two billion, one hundred sixty-four million, two hundred twenty-one thousand, three hundred seventy-two".