2121770 has 32 divisors (see below), whose sum is σ = 4624128. Its totient is φ = 684288.

The previous prime is 2121767. The next prime is 2121781. The reversal of 2121770 is 771212.

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, 299 + ... + 2081.

It is an arithmetic number, because the mean of its divisors is an integer number (144504).

2^2121770 is an apocalyptic number.

2121770 is an abundant number, since it is smaller than the sum of its proper divisors (2502358).

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

2121770 is a wasteful number, since it uses less digits than its factorization.

2121770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1814.

The product of its (nonzero) digits is 196, while the sum is 20.

The square root of 2121770 is about 1456.6296715363. The cubic root of 2121770 is about 128.4989073676.

Adding to 2121770 its reverse (771212), we get a palindrome (2892982).

The spelling of 2121770 in words is "two million, one hundred twenty-one thousand, seven hundred seventy".