2121090 has 32 divisors (see below), whose sum is σ = 5391360. Its totient is φ = 532224.

The previous prime is 2121043. The next prime is 2121121. The reversal of 2121090 is 901212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

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, 1570 + ... + 2589.

It is an arithmetic number, because the mean of its divisors is an integer number (168480).

2^2121090 is an apocalyptic number.

2121090 is an abundant number, since it is smaller than the sum of its proper divisors (3270270).

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

2121090 is a wasteful number, since it uses less digits than its factorization.

2121090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4186.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 2121090 is about 1456.3962372926. The cubic root of 2121090 is about 128.4851784850.

The spelling of 2121090 in words is "two million, one hundred twenty-one thousand, ninety".