21133132201991 has 2 divisors, whose sum is σ = 21133132201992. Its totient is φ = 21133132201990.

The previous prime is 21133132201957. The next prime is 21133132202029. The reversal of 21133132201991 is 19910223133112.

It is an a-pointer prime, because the next prime (21133132202029) can be obtained adding 21133132201991 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21133132201991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21133132200991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10566566100995 + 10566566100996.

It is an arithmetic number, because the mean of its divisors is an integer number (10566566100996).

Almost surely, 2^{21133132201991} is an apocalyptic number.

21133132201991 is a deficient number, since it is larger than the sum of its proper divisors (1).

21133132201991 is an equidigital number, since it uses as much as digits as its factorization.

21133132201991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 38.

The spelling of 21133132201991 in words is "twenty-one trillion, one hundred thirty-three billion, one hundred thirty-two million, two hundred one thousand, nine hundred ninety-one".