20111021200031 has 2 divisors, whose sum is σ = 20111021200032. Its totient is φ = 20111021200030.

The previous prime is 20111021199989. The next prime is 20111021200033. The reversal of 20111021200031 is 13000212011102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20111021200031 - 2²² = 20111017005727 is a prime.

It is a super-2 number, since 2×20111021200031² (a number of 27 digits) contains 22 as substring.

Together with 20111021200033, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20111021199979 and 20111021200015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20111021200033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055510600015 + 10055510600016.

It is an arithmetic number, because the mean of its divisors is an integer number (10055510600016).

Almost surely, 2^{20111021200031} is an apocalyptic number.

20111021200031 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111021200031 is an equidigital number, since it uses as much as digits as its factorization.

20111021200031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 20111021200031 its reverse (13000212011102), we get a palindrome (33111233211133).

The spelling of 20111021200031 in words is "twenty trillion, one hundred eleven billion, twenty-one million, two hundred thousand, thirty-one".