2121773 has 4 divisors (see below), whose sum is σ = 2214048. Its totient is φ = 2029500.

The previous prime is 2121767. The next prime is 2121781. The reversal of 2121773 is 3771212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2121773 - 2¹² = 2117677 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 92251 = 2121773 / (2 + 1 + 2 + 1 + 7 + 7 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121793) 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 3 ways as a sum of consecutive naturals, for example, 46103 + ... + 46148.

It is an arithmetic number, because the mean of its divisors is an integer number (553512).

2^2121773 is an apocalyptic number.

2121773 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

2121773 is a deficient number, since it is larger than the sum of its proper divisors (92275).

2121773 is an equidigital number, since it uses as much as digits as its factorization.

2121773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92274.

The product of its digits is 588, while the sum is 23.

The square root of 2121773 is about 1456.6307013104. The cubic root of 2121773 is about 128.4989679297.

Adding to 2121773 its reverse (3771212), we get a palindrome (5892985).

The spelling of 2121773 in words is "two million, one hundred twenty-one thousand, seven hundred seventy-three".