211220033231 has 2 divisors, whose sum is σ = 211220033232. Its totient is φ = 211220033230.

The previous prime is 211220033153. The next prime is 211220033237. The reversal of 211220033231 is 132330022112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211220033231 is a prime.

It is a super-2 number, since 2×211220033231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211220033237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610016615 + 105610016616.

It is an arithmetic number, because the mean of its divisors is an integer number (105610016616).

Almost surely, 2^211220033231 is an apocalyptic number.

211220033231 is a deficient number, since it is larger than the sum of its proper divisors (1).

211220033231 is an equidigital number, since it uses as much as digits as its factorization.

211220033231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 211220033231 its reverse (132330022112), we get a palindrome (343550055343).

The spelling of 211220033231 in words is "two hundred eleven billion, two hundred twenty million, thirty-three thousand, two hundred thirty-one".