4231120921 has 2 divisors, whose sum is σ = 4231120922. Its totient is φ = 4231120920.

The previous prime is 4231120919. The next prime is 4231120931. The reversal of 4231120921 is 1290211324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2182291225 + 2048829696 = 46715^2 + 45264^2 .

It is a cyclic number.

It is not a de Polignac number, because 4231120921 - 2¹ = 4231120919 is a prime.

Together with 4231120919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (4231120931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2115560460 + 2115560461.

It is an arithmetic number, because the mean of its divisors is an integer number (2115560461).

Almost surely, 2^4231120921 is an apocalyptic number.

It is an amenable number.

4231120921 is a deficient number, since it is larger than the sum of its proper divisors (1).

4231120921 is an equidigital number, since it uses as much as digits as its factorization.

4231120921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 4231120921 is about 65047.0669669279. The cubic root of 4231120921 is about 1617.4038742487.

The spelling of 4231120921 in words is "four billion, two hundred thirty-one million, one hundred twenty thousand, nine hundred twenty-one".