221668703387 has 2 divisors, whose sum is σ = 221668703388. Its totient is φ = 221668703386.

The previous prime is 221668703383. The next prime is 221668703393. The reversal of 221668703387 is 783307866122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221668703387 - 2² = 221668703383 is a prime.

It is a super-2 number, since 2×221668703387² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221668703383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110834351693 + 110834351694.

It is an arithmetic number, because the mean of its divisors is an integer number (110834351694).

Almost surely, 2^221668703387 is an apocalyptic number.

221668703387 is a deficient number, since it is larger than the sum of its proper divisors (1).

221668703387 is an equidigital number, since it uses as much as digits as its factorization.

221668703387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4064256, while the sum is 53.

The spelling of 221668703387 in words is "two hundred twenty-one billion, six hundred sixty-eight million, seven hundred three thousand, three hundred eighty-seven".