12021291523 has 2 divisors, whose sum is σ = 12021291524. Its totient is φ = 12021291522.

The previous prime is 12021291521. The next prime is 12021291547. The reversal of 12021291523 is 32519212021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12021291523 - 2¹ = 12021291521 is a prime.

It is a super-2 number, since 2×12021291523² (a number of 21 digits) contains 22 as substring.

Together with 12021291521, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 12021291491 and 12021291500.

It is not a weakly prime, because it can be changed into another prime (12021291521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6010645761 + 6010645762.

It is an arithmetic number, because the mean of its divisors is an integer number (6010645762).

Almost surely, 2^12021291523 is an apocalyptic number.

12021291523 is a deficient number, since it is larger than the sum of its proper divisors (1).

12021291523 is an equidigital number, since it uses as much as digits as its factorization.

12021291523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 28.

The spelling of 12021291523 in words is "twelve billion, twenty-one million, two hundred ninety-one thousand, five hundred twenty-three".