20423255123291 has 2 divisors, whose sum is σ = 20423255123292. Its totient is φ = 20423255123290.

The previous prime is 20423255123267. The next prime is 20423255123413. The reversal of 20423255123291 is 19232155232402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20423255123291 - 2¹⁴ = 20423255106907 is a prime.

It is a super-2 number, since 2×20423255123291² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20423255123251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10211627561645 + 10211627561646.

It is an arithmetic number, because the mean of its divisors is an integer number (10211627561646).

Almost surely, 2^{20423255123291} is an apocalyptic number.

20423255123291 is a deficient number, since it is larger than the sum of its proper divisors (1).

20423255123291 is an equidigital number, since it uses as much as digits as its factorization.

20423255123291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 259200, while the sum is 41.

The spelling of 20423255123291 in words is "twenty trillion, four hundred twenty-three billion, two hundred fifty-five million, one hundred twenty-three thousand, two hundred ninety-one".