2121973 has 4 divisors (see below), whose sum is σ = 2425120. Its totient is φ = 1818828.

The previous prime is 2121967. The next prime is 2121979. The reversal of 2121973 is 3791212.

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 an interprime number because it is at equal distance from previous prime (2121967) and next prime (2121979).

It is a cyclic number.

It is not a de Polignac number, because 2121973 - 2⁵ = 2121941 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 (2121979) 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, 151563 + ... + 151576.

It is an arithmetic number, because the mean of its divisors is an integer number (606280).

2^2121973 is an apocalyptic number.

It is an amenable number.

2121973 is a deficient number, since it is larger than the sum of its proper divisors (303147).

2121973 is an equidigital number, since it uses as much as digits as its factorization.

2121973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303146.

The product of its digits is 756, while the sum is 25.

The square root of 2121973 is about 1456.6993512733. The cubic root of 2121973 is about 128.5030052742.

The spelling of 2121973 in words is "two million, one hundred twenty-one thousand, nine hundred seventy-three".