2121197 has 4 divisors (see below), whose sum is σ = 2284380. Its totient is φ = 1958016.

The previous prime is 2121193. The next prime is 2121199. The reversal of 2121197 is 7911212.

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

It can be written as a sum of positive squares in 2 ways, for example, as 749956 + 1371241 = 866^2 + 1171^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121197 - 2² = 2121193 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 (2121191) 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, 81572 + ... + 81597.

It is an arithmetic number, because the mean of its divisors is an integer number (571095).

2^2121197 is an apocalyptic number.

It is an amenable number.

2121197 is a deficient number, since it is larger than the sum of its proper divisors (163183).

2121197 is a wasteful number, since it uses less digits than its factorization.

2121197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163182.

The product of its digits is 252, while the sum is 23.

The square root of 2121197 is about 1456.4329713379. The cubic root of 2121197 is about 128.4873389596.

The spelling of 2121197 in words is "two million, one hundred twenty-one thousand, one hundred ninety-seven".