11885902421 has 2 divisors, whose sum is σ = 11885902422. Its totient is φ = 11885902420.

The previous prime is 11885902381. The next prime is 11885902451. The reversal of 11885902421 is 12420958811.

11885902421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11669400625 + 216501796 = 108025^2 + 14714^2 .

It is a cyclic number.

It is not a de Polignac number, because 11885902421 - 2¹⁰ = 11885901397 is a prime.

It is a super-2 number, since 2×11885902421² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11885902451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5942951210 + 5942951211.

It is an arithmetic number, because the mean of its divisors is an integer number (5942951211).

Almost surely, 2^11885902421 is an apocalyptic number.

It is an amenable number.

11885902421 is a deficient number, since it is larger than the sum of its proper divisors (1).

11885902421 is an equidigital number, since it uses as much as digits as its factorization.

11885902421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46080, while the sum is 41.

The spelling of 11885902421 in words is "eleven billion, eight hundred eighty-five million, nine hundred two thousand, four hundred twenty-one".