221210011031 has 2 divisors, whose sum is σ = 221210011032. Its totient is φ = 221210011030.

The previous prime is 221210011007. The next prime is 221210011051. The reversal of 221210011031 is 130110012122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221210011031 is a prime.

It is a super-2 number, since 2×221210011031² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221210010997 and 221210011015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221210011051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605005515 + 110605005516.

It is an arithmetic number, because the mean of its divisors is an integer number (110605005516).

Almost surely, 2^221210011031 is an apocalyptic number.

221210011031 is a deficient number, since it is larger than the sum of its proper divisors (1).

221210011031 is an equidigital number, since it uses as much as digits as its factorization.

221210011031 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 221210011031 its reverse (130110012122), we get a palindrome (351320023153).

The spelling of 221210011031 in words is "two hundred twenty-one billion, two hundred ten million, eleven thousand, thirty-one".