2121137 has 4 divisors (see below), whose sum is σ = 2145060. Its totient is φ = 2097216.

The previous prime is 2121131. The next prime is 2121143. The reversal of 2121137 is 7311212.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2121131) and next prime (2121143).

It can be written as a sum of positive squares in 2 ways, for example, as 1168561 + 952576 = 1081^2 + 976^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121137 - 2⁴ = 2121121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11828 + ... + 12005.

It is an arithmetic number, because the mean of its divisors is an integer number (536265).

2^2121137 is an apocalyptic number.

It is an amenable number.

2121137 is a deficient number, since it is larger than the sum of its proper divisors (23923).

2121137 is an equidigital number, since it uses as much as digits as its factorization.

2121137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23922.

The product of its digits is 84, while the sum is 17.

The square root of 2121137 is about 1456.4123729219. The cubic root of 2121137 is about 128.4861274875.

Adding to 2121137 its reverse (7311212), we get a palindrome (9432349).

The spelling of 2121137 in words is "two million, one hundred twenty-one thousand, one hundred thirty-seven".