4028507518421 has 2 divisors, whose sum is σ = 4028507518422. Its totient is φ = 4028507518420.

The previous prime is 4028507518319. The next prime is 4028507518433. The reversal of 4028507518421 is 1248157058204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4015659295921 + 12848222500 = 2003911^2 + 113350^2 .

It is a cyclic number.

It is not a de Polignac number, because 4028507518421 - 2²⁶ = 4028440409557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4028507515421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2014253759210 + 2014253759211.

It is an arithmetic number, because the mean of its divisors is an integer number (2014253759211).

Almost surely, 2^{4028507518421} is an apocalyptic number.

It is an amenable number.

4028507518421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4028507518421 is an equidigital number, since it uses as much as digits as its factorization.

4028507518421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 716800, while the sum is 47.

The spelling of 4028507518421 in words is "four trillion, twenty-eight billion, five hundred seven million, five hundred eighteen thousand, four hundred twenty-one".