2123921930 has 32 divisors (see below), whose sum is σ = 4157930448. Its totient is φ = 776448000.

The previous prime is 2123921857. The next prime is 2123921939. The reversal of 2123921930 is 391293212.

It can be written as a sum of positive squares in 8 ways, for example, as 1083923929 + 1039998001 = 32923^2 + 32249^2 .

It is a super-2 number, since 2×2123921930² = 9022088729469849800, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2123921939) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67751 + ... + 94010.

Almost surely, 2^2123921930 is an apocalyptic number.

2123921930 is a deficient number, since it is larger than the sum of its proper divisors (2034008518).

2123921930 is a wasteful number, since it uses less digits than its factorization.

2123921930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161882.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 2123921930 is about 46086.0274920718. The cubic root of 2123921930 is about 1285.4233450977.

The spelling of 2123921930 in words is "two billion, one hundred twenty-three million, nine hundred twenty-one thousand, nine hundred thirty".