221012031313 has 2 divisors, whose sum is σ = 221012031314. Its totient is φ = 221012031312.

The previous prime is 221012031311. The next prime is 221012031323. The reversal of 221012031313 is 313130210122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138449479744 + 82562551569 = 372088^2 + 287337^2 .

It is a cyclic number.

It is not a de Polignac number, because 221012031313 - 2¹ = 221012031311 is a prime.

Together with 221012031311, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (221012031311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110506015656 + 110506015657.

It is an arithmetic number, because the mean of its divisors is an integer number (110506015657).

Almost surely, 2^221012031313 is an apocalyptic number.

It is an amenable number.

221012031313 is a deficient number, since it is larger than the sum of its proper divisors (1).

221012031313 is an equidigital number, since it uses as much as digits as its factorization.

221012031313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 221012031313 its reverse (313130210122), we get a palindrome (534142241435).

The spelling of 221012031313 in words is "two hundred twenty-one billion, twelve million, thirty-one thousand, three hundred thirteen".