20212132101991 has 2 divisors, whose sum is σ = 20212132101992. Its totient is φ = 20212132101990.

The previous prime is 20212132101989. The next prime is 20212132102033. The reversal of 20212132101991 is 19910123121202.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20212132101991 - 2¹ = 20212132101989 is a prime.

Together with 20212132101989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20212132101971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106066050995 + 10106066050996.

It is an arithmetic number, because the mean of its divisors is an integer number (10106066050996).

Almost surely, 2^{20212132101991} is an apocalyptic number.

20212132101991 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212132101991 is an equidigital number, since it uses as much as digits as its factorization.

20212132101991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 34.

The spelling of 20212132101991 in words is "twenty trillion, two hundred twelve billion, one hundred thirty-two million, one hundred one thousand, nine hundred ninety-one".