2147189921 has 4 divisors (see below), whose sum is σ = 2216454144. Its totient is φ = 2077925700.

The previous prime is 2147189917. The next prime is 2147189959. The reversal of 2147189921 is 1299817412.

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 2147189921 - 2² = 2147189917 is a prime.

It is a super-2 number, since 2×2147189921² = 9220849113687972482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2147189911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34632065 + ... + 34632126.

It is an arithmetic number, because the mean of its divisors is an integer number (554113536).

Almost surely, 2^2147189921 is an apocalyptic number.

It is an amenable number.

2147189921 is a deficient number, since it is larger than the sum of its proper divisors (69264223).

2147189921 is an equidigital number, since it uses as much as digits as its factorization.

2147189921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69264222.

The product of its digits is 72576, while the sum is 44.

The square root of 2147189921 is about 46337.7807086183. The cubic root of 2147189921 is about 1290.1003309181.

The spelling of 2147189921 in words is "two billion, one hundred forty-seven million, one hundred eighty-nine thousand, nine hundred twenty-one".