21132133021991 has 2 divisors, whose sum is σ = 21132133021992. Its totient is φ = 21132133021990.

The previous prime is 21132133021891. The next prime is 21132133022111. The reversal of 21132133021991 is 19912033123112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21132133021991 - 2²² = 21132128827687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21132133021291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10566066510995 + 10566066510996.

It is an arithmetic number, because the mean of its divisors is an integer number (10566066510996).

Almost surely, 2^{21132133021991} is an apocalyptic number.

21132133021991 is a deficient number, since it is larger than the sum of its proper divisors (1).

21132133021991 is an equidigital number, since it uses as much as digits as its factorization.

21132133021991 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 21132133021991 in words is "twenty-one trillion, one hundred thirty-two billion, one hundred thirty-three million, twenty-one thousand, nine hundred ninety-one".