2121930 has 64 divisors (see below), whose sum is σ = 5875200. Its totient is φ = 544320.

The previous prime is 2121907. The next prime is 2121941. The reversal of 2121930 is 391212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7695 + ... + 7965.

It is an arithmetic number, because the mean of its divisors is an integer number (91800).

2^2121930 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2121930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2937600).

2121930 is an abundant number, since it is smaller than the sum of its proper divisors (3753270).

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

2121930 is a wasteful number, since it uses less digits than its factorization.

2121930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316 (or 310 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 2121930 is about 1456.6845918043. The cubic root of 2121930 is about 128.5021372666.

The spelling of 2121930 in words is "two million, one hundred twenty-one thousand, nine hundred thirty".