2123042921 has 2 divisors, whose sum is σ = 2123042922. Its totient is φ = 2123042920.

The previous prime is 2123042903. The next prime is 2123042941. The reversal of 2123042921 is 1292403212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1433455321 + 689587600 = 37861^2 + 26260^2 .

It is a cyclic number.

It is not a de Polignac number, because 2123042921 - 2¹⁰ = 2123041897 is a prime.

It is a super-2 number, since 2×2123042921² = 9014622488816424482, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2123042941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061521460 + 1061521461.

It is an arithmetic number, because the mean of its divisors is an integer number (1061521461).

Almost surely, 2^2123042921 is an apocalyptic number.

It is an amenable number.

2123042921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2123042921 is an equidigital number, since it uses as much as digits as its factorization.

2123042921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 2123042921 is about 46076.4898945221. The cubic root of 2123042921 is about 1285.2459916550.

The spelling of 2123042921 in words is "two billion, one hundred twenty-three million, forty-two thousand, nine hundred twenty-one".