2121669 has 24 divisors (see below), whose sum is σ = 3463200. Its totient is φ = 1239840.

The previous prime is 2121667. The next prime is 2121683. The reversal of 2121669 is 9661212.

2121669 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2121669 - 2¹ = 2121667 is a prime.

It is a super-2 number, since 2×2121669² = 9002958691122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2502 + ... + 3240.

It is an arithmetic number, because the mean of its divisors is an integer number (144300).

2^2121669 is an apocalyptic number.

2121669 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

2121669 is a deficient number, since it is larger than the sum of its proper divisors (1341531).

2121669 is a wasteful number, since it uses less digits than its factorization.

2121669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785 (or 782 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 2121669 is about 1456.5950020510. The cubic root of 2121669 is about 128.4968684102.

It can be divided in two parts, 212 and 1669, that added together give a palindrome (1881).

The spelling of 2121669 in words is "two million, one hundred twenty-one thousand, six hundred sixty-nine".