2137320221 has 2 divisors, whose sum is σ = 2137320222. Its totient is φ = 2137320220.

The previous prime is 2137320179. The next prime is 2137320319. The reversal of 2137320221 is 1220237312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1473484996 + 663835225 = 38386^2 + 25765^2 .

It is a cyclic number.

It is not a de Polignac number, because 2137320221 - 2¹⁴ = 2137303837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2137320821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1068660110 + 1068660111.

It is an arithmetic number, because the mean of its divisors is an integer number (1068660111).

Almost surely, 2^2137320221 is an apocalyptic number.

It is an amenable number.

2137320221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2137320221 is an equidigital number, since it uses as much as digits as its factorization.

2137320221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 2137320221 is about 46231.1607143926. The cubic root of 2137320221 is about 1288.1206174495.

Adding to 2137320221 its reverse (1220237312), we get a palindrome (3357557533).

The spelling of 2137320221 in words is "two billion, one hundred thirty-seven million, three hundred twenty thousand, two hundred twenty-one".