20211100000031 has 2 divisors, whose sum is σ = 20211100000032. Its totient is φ = 20211100000030.

The previous prime is 20211099999967. The next prime is 20211100000057. The reversal of 20211100000031 is 13000000111202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20211100000031 - 2⁶ = 20211099999967 is a prime.

It is a super-2 number, since 2×20211100000031² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20211099999958 and 20211100000021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20211100000081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105550000015 + 10105550000016.

It is an arithmetic number, because the mean of its divisors is an integer number (10105550000016).

Almost surely, 2^{20211100000031} is an apocalyptic number.

20211100000031 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211100000031 is an equidigital number, since it uses as much as digits as its factorization.

20211100000031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 20211100000031 its reverse (13000000111202), we get a palindrome (33211100111233).

The spelling of 20211100000031 in words is "twenty trillion, two hundred eleven billion, one hundred million, thirty-one", and thus it is an aban number.