221023312031287 has 2 divisors, whose sum is σ = 221023312031288. Its totient is φ = 221023312031286.

The previous prime is 221023312031261. The next prime is 221023312031377. The reversal of 221023312031287 is 782130213320122.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221023312031287 is a prime.

It is a super-2 number, since 2×221023312031287² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221023312031237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110511656015643 + 110511656015644.

It is an arithmetic number, because the mean of its divisors is an integer number (110511656015644).

Almost surely, 2^{221023312031287} is an apocalyptic number.

221023312031287 is a deficient number, since it is larger than the sum of its proper divisors (1).

221023312031287 is an equidigital number, since it uses as much as digits as its factorization.

221023312031287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 37.

The spelling of 221023312031287 in words is "two hundred twenty-one trillion, twenty-three billion, three hundred twelve million, thirty-one thousand, two hundred eighty-seven".