221330320031 has 2 divisors, whose sum is σ = 221330320032. Its totient is φ = 221330320030.

The previous prime is 221330320027. The next prime is 221330320097. The reversal of 221330320031 is 130023033122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221330320031 - 2² = 221330320027 is a prime.

It is a super-2 number, since 2×221330320031² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 221330319985 and 221330320012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221330320331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110665160015 + 110665160016.

It is an arithmetic number, because the mean of its divisors is an integer number (110665160016).

Almost surely, 2^221330320031 is an apocalyptic number.

221330320031 is a deficient number, since it is larger than the sum of its proper divisors (1).

221330320031 is an equidigital number, since it uses as much as digits as its factorization.

221330320031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 221330320031 its reverse (130023033122), we get a palindrome (351353353153).

The spelling of 221330320031 in words is "two hundred twenty-one billion, three hundred thirty million, three hundred twenty thousand, thirty-one".