20110211202031 has 2 divisors, whose sum is σ = 20110211202032. Its totient is φ = 20110211202030.

The previous prime is 20110211202001. The next prime is 20110211202073. The reversal of 20110211202031 is 13020211201102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20110211202031 - 2²¹ = 20110209104879 is a prime.

It is a super-2 number, since 2×20110211202031² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20110211201996 and 20110211202014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20110211202001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055105601015 + 10055105601016.

It is an arithmetic number, because the mean of its divisors is an integer number (10055105601016).

Almost surely, 2^{20110211202031} is an apocalyptic number.

20110211202031 is a deficient number, since it is larger than the sum of its proper divisors (1).

20110211202031 is an equidigital number, since it uses as much as digits as its factorization.

20110211202031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 20110211202031 its reverse (13020211201102), we get a palindrome (33130422403133).

The spelling of 20110211202031 in words is "twenty trillion, one hundred ten billion, two hundred eleven million, two hundred two thousand, thirty-one".