2121771 has 8 divisors (see below), whose sum is σ = 2847040. Its totient is φ = 1405512.

The previous prime is 2121767. The next prime is 2121781. The reversal of 2121771 is 1771212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2121771 - 2² = 2121767 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1681 + ... + 2658.

It is an arithmetic number, because the mean of its divisors is an integer number (355880).

2^2121771 is an apocalyptic number.

2121771 is a deficient number, since it is larger than the sum of its proper divisors (725269).

2121771 is a wasteful number, since it uses less digits than its factorization.

2121771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4505.

The product of its digits is 196, while the sum is 21.

The square root of 2121771 is about 1456.6300147944. The cubic root of 2121771 is about 128.4989275549.

Adding to 2121771 its reverse (1771212), we get a palindrome (3892983).

The spelling of 2121771 in words is "two million, one hundred twenty-one thousand, seven hundred seventy-one".