20031211199971 has 2 divisors, whose sum is σ = 20031211199972. Its totient is φ = 20031211199970.

The previous prime is 20031211199969. The next prime is 20031211200109. The reversal of 20031211199971 is 17999111213002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20031211199971 - 2¹ = 20031211199969 is a prime.

Together with 20031211199969, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20031211199921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10015605599985 + 10015605599986.

It is an arithmetic number, because the mean of its divisors is an integer number (10015605599986).

Almost surely, 2^{20031211199971} is an apocalyptic number.

20031211199971 is a deficient number, since it is larger than the sum of its proper divisors (1).

20031211199971 is an equidigital number, since it uses as much as digits as its factorization.

20031211199971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 61236, while the sum is 46.

The spelling of 20031211199971 in words is "twenty trillion, thirty-one billion, two hundred eleven million, one hundred ninety-nine thousand, nine hundred seventy-one".