2121698 has 16 divisors (see below), whose sum is σ = 3327480. Its totient is φ = 1013376.

The previous prime is 2121683. The next prime is 2121737. The reversal of 2121698 is 8961212.

2121698 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1352569 + 769129 = 1163^2 + 877^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121698.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 8990 + ... + 9222.

2^2121698 is an apocalyptic number.

2121698 is a deficient number, since it is larger than the sum of its proper divisors (1205782).

2121698 is a wasteful number, since it uses less digits than its factorization.

2121698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421.

The product of its digits is 1728, while the sum is 29.

The square root of 2121698 is about 1456.6049567402. The cubic root of 2121698 is about 128.4974538600.

It can be divided in two parts, 212 and 1698, that multiplied together give a triangular number (359976 = T₈₄₈).

The spelling of 2121698 in words is "two million, one hundred twenty-one thousand, six hundred ninety-eight".