21230133191 has 2 divisors, whose sum is σ = 21230133192. Its totient is φ = 21230133190.

The previous prime is 21230133179. The next prime is 21230133229. The reversal of 21230133191 is 19133103212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21230133191 is a prime.

It is a super-3 number, since 3×21230133191³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21230133191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21230133101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615066595 + 10615066596.

It is an arithmetic number, because the mean of its divisors is an integer number (10615066596).

Almost surely, 2^21230133191 is an apocalyptic number.

21230133191 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230133191 is an equidigital number, since it uses as much as digits as its factorization.

21230133191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 26.

The spelling of 21230133191 in words is "twenty-one billion, two hundred thirty million, one hundred thirty-three thousand, one hundred ninety-one".