221668703386 has 8 divisors (see below), whose sum is σ = 358080213204. Its totient is φ = 102308632320.

The previous prime is 221668703383. The next prime is 221668703387. The reversal of 221668703386 is 683307866122.

It can be written as a sum of positive squares in 2 ways, for example, as 221493538161 + 175165225 = 470631^2 + 13235^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (221668703383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4262859655 + ... + 4262859706.

Almost surely, 2^221668703386 is an apocalyptic number.

221668703386 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

221668703386 is a deficient number, since it is larger than the sum of its proper divisors (136411509818).

221668703386 is a wasteful number, since it uses less digits than its factorization.

221668703386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8525719376.

The product of its (nonzero) digits is 3483648, while the sum is 52.

The spelling of 221668703386 in words is "two hundred twenty-one billion, six hundred sixty-eight million, seven hundred three thousand, three hundred eighty-six".