2121290 has 24 divisors (see below), whose sum is σ = 4001508. Its totient is φ = 809600.

The previous prime is 2121289. The next prime is 2121323. The reversal of 2121290 is 921212.

It can be written as a sum of positive squares in 2 ways, for example, as 1968409 + 152881 = 1403^2 + 391^2 .

It is a hoax number, since the sum of its digits (17) coincides with the sum of the digits of its distinct prime factors.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5090 + ... + 5490.

2^2121290 is an apocalyptic number.

2121290 is a deficient number, since it is larger than the sum of its proper divisors (1880218).

2121290 is a wasteful number, since it uses less digits than its factorization.

2121290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454 (or 431 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 2121290 is about 1456.4648983069. The cubic root of 2121290 is about 128.4892166962.

The spelling of 2121290 in words is "two million, one hundred twenty-one thousand, two hundred ninety".