4021312123 has 2 divisors, whose sum is σ = 4021312124. Its totient is φ = 4021312122.

The previous prime is 4021312093. The next prime is 4021312189. The reversal of 4021312123 is 3212131204.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4021312123 - 2²⁵ = 3987757691 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4021312123.

It is not a weakly prime, because it can be changed into another prime (4021312193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2010656061 + 2010656062.

It is an arithmetic number, because the mean of its divisors is an integer number (2010656062).

Almost surely, 2^4021312123 is an apocalyptic number.

4021312123 is a deficient number, since it is larger than the sum of its proper divisors (1).

4021312123 is an equidigital number, since it uses as much as digits as its factorization.

4021312123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 4021312123 is about 63413.8164992457. The cubic root of 4021312123 is about 1590.2153002756.

Adding to 4021312123 its reverse (3212131204), we get a palindrome (7233443327).

The spelling of 4021312123 in words is "four billion, twenty-one million, three hundred twelve thousand, one hundred twenty-three".