2137201021 has 2 divisors, whose sum is σ = 2137201022. Its totient is φ = 2137201020.

The previous prime is 2137200953. The next prime is 2137201051. The reversal of 2137201021 is 1201027312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1913100121 + 224100900 = 43739^2 + 14970^2 .

It is a cyclic number.

It is not a de Polignac number, because 2137201021 - 2²⁷ = 2002983293 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2137201021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2137201051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1068600510 + 1068600511.

It is an arithmetic number, because the mean of its divisors is an integer number (1068600511).

Almost surely, 2^2137201021 is an apocalyptic number.

It is an amenable number.

2137201021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2137201021 is an equidigital number, since it uses as much as digits as its factorization.

2137201021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 2137201021 is about 46229.8715226422. The cubic root of 2137201021 is about 1288.0966705103.

Adding to 2137201021 its reverse (1201027312), we get a palindrome (3338228333).

The spelling of 2137201021 in words is "two billion, one hundred thirty-seven million, two hundred one thousand, twenty-one".