2121965 has 8 divisors (see below), whose sum is σ = 2555160. Its totient is φ = 1691712.

The previous prime is 2121943. The next prime is 2121967. The reversal of 2121965 is 5691212.

It can be written as a sum of positive squares in 4 ways, for example, as 310249 + 1811716 = 557^2 + 1346^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2121965 - 2¹⁰ = 2120941 is a prime.

It is a super-2 number, since 2×2121965² = 9005470922450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121967) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1451 + ... + 2519.

It is an arithmetic number, because the mean of its divisors is an integer number (319395).

2^2121965 is an apocalyptic number.

It is an amenable number.

2121965 is a deficient number, since it is larger than the sum of its proper divisors (433195).

2121965 is a wasteful number, since it uses less digits than its factorization.

2121965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1471.

The product of its digits is 1080, while the sum is 26.

The square root of 2121965 is about 1456.6966053369. The cubic root of 2121965 is about 128.5028437853.

The spelling of 2121965 in words is "two million, one hundred twenty-one thousand, nine hundred sixty-five".