221320101031 has 2 divisors, whose sum is σ = 221320101032. Its totient is φ = 221320101030.

The previous prime is 221320101019. The next prime is 221320101043. The reversal of 221320101031 is 130101023122.

It is a balanced prime because it is at equal distance from previous prime (221320101019) and next prime (221320101043).

It is a cyclic number.

It is not a de Polignac number, because 221320101031 - 2¹¹ = 221320098983 is a prime.

It is a super-2 number, since 2×221320101031² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221320100996 and 221320101014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221320101091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110660050515 + 110660050516.

It is an arithmetic number, because the mean of its divisors is an integer number (110660050516).

Almost surely, 2^221320101031 is an apocalyptic number.

221320101031 is a deficient number, since it is larger than the sum of its proper divisors (1).

221320101031 is an equidigital number, since it uses as much as digits as its factorization.

221320101031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 221320101031 its reverse (130101023122), we get a palindrome (351421124153).

The spelling of 221320101031 in words is "two hundred twenty-one billion, three hundred twenty million, one hundred one thousand, thirty-one".