2127387221 has 4 divisors (see below), whose sum is σ = 2127479532. Its totient is φ = 2127294912.

The previous prime is 2127387173. The next prime is 2127387233. The reversal of 2127387221 is 1227837212.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 749938225 + 1377448996 = 27385^2 + 37114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2127387221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2127387281) 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, 20525 + ... + 68381.

It is an arithmetic number, because the mean of its divisors is an integer number (531869883).

Almost surely, 2^2127387221 is an apocalyptic number.

It is an amenable number.

2127387221 is a deficient number, since it is larger than the sum of its proper divisors (92311).

2127387221 is an equidigital number, since it uses as much as digits as its factorization.

2127387221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92310.

The product of its digits is 18816, while the sum is 35.

The square root of 2127387221 is about 46123.6080657184. The cubic root of 2127387221 is about 1286.1220439793.

The spelling of 2127387221 in words is "two billion, one hundred twenty-seven million, three hundred eighty-seven thousand, two hundred twenty-one".