2121347 has 4 divisors (see below), whose sum is σ = 2124360. Its totient is φ = 2118336.

The previous prime is 2121341. The next prime is 2121367. The reversal of 2121347 is 7431212.

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 is a cyclic number.

It is not a de Polignac number, because 2121347 - 2¹⁸ = 1859203 is a prime.

It is a super-2 number, since 2×2121347² = 9000226188818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121341) 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, 179 + ... + 2067.

It is an arithmetic number, because the mean of its divisors is an integer number (531090).

2^2121347 is an apocalyptic number.

2121347 is a deficient number, since it is larger than the sum of its proper divisors (3013).

2121347 is a wasteful number, since it uses less digits than its factorization.

2121347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3012.

The product of its digits is 336, while the sum is 20.

The square root of 2121347 is about 1456.4844661032. The cubic root of 2121347 is about 128.4903675399.

Adding to 2121347 its reverse (7431212), we get a palindrome (9552559).

The spelling of 2121347 in words is "two million, one hundred twenty-one thousand, three hundred forty-seven".