2121023291 has 2 divisors, whose sum is σ = 2121023292. Its totient is φ = 2121023290.

The previous prime is 2121023239. The next prime is 2121023323. The reversal of 2121023291 is 1923201212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121023291 is a prime.

It is not a weakly prime, because it can be changed into another prime (2121023491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060511645 + 1060511646.

It is an arithmetic number, because the mean of its divisors is an integer number (1060511646).

Almost surely, 2^2121023291 is an apocalyptic number.

2121023291 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121023291 is an equidigital number, since it uses as much as digits as its factorization.

2121023291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 2121023291 is about 46054.5686224505. The cubic root of 2121023291 is about 1284.8383150341.

The spelling of 2121023291 in words is "two billion, one hundred twenty-one million, twenty-three thousand, two hundred ninety-one".