2121690 has 32 divisors (see below), whose sum is σ = 5132160. Its totient is φ = 561344.

The previous prime is 2121683. The next prime is 2121737. The reversal of 2121690 is 961212.

It is a super-2 number, since 2×2121690² = 9003136912200, which contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5731 + ... + 6089.

It is an arithmetic number, because the mean of its divisors is an integer number (160380).

2^2121690 is an apocalyptic number.

2121690 is an abundant number, since it is smaller than the sum of its proper divisors (3010470).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2121690 is a wasteful number, since it uses less digits than its factorization.

2121690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 2121690 is about 1456.6022106258. The cubic root of 2121690 is about 128.4972923572.

The spelling of 2121690 in words is "two million, one hundred twenty-one thousand, six hundred ninety".