2121850 has 12 divisors (see below), whose sum is σ = 3946734. Its totient is φ = 848720.

The previous prime is 2121841. The next prime is 2121853. The reversal of 2121850 is 581212.

It can be written as a sum of positive squares in 3 ways, for example, as 2076481 + 45369 = 1441^2 + 213^2 .

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

It is not an unprimeable number, because it can be changed into a prime (2121853) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21169 + ... + 21268.

2^2121850 is an apocalyptic number.

2121850 is a deficient number, since it is larger than the sum of its proper divisors (1824884).

2121850 is a wasteful number, since it uses less digits than its factorization.

2121850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42449 (or 42444 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 2121850 is about 1456.6571319291. The cubic root of 2121850 is about 128.5005223374.

It can be divided in two parts, 21218 and 50, that multiplied together give a square (1060900 = 1030²).

The spelling of 2121850 in words is "two million, one hundred twenty-one thousand, eight hundred fifty".