221734651318 has 16 divisors (see below), whose sum is σ = 346402371744. Its totient is φ = 106351600320.

The previous prime is 221734651283. The next prime is 221734651319. The reversal of 221734651318 is 813156437122.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221734651319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21096255 + ... + 21106762.

It is an arithmetic number, because the mean of its divisors is an integer number (21650148234).

Almost surely, 2^221734651318 is an apocalyptic number.

221734651318 is a deficient number, since it is larger than the sum of its proper divisors (124667720426).

221734651318 is a wasteful number, since it uses less digits than its factorization.

221734651318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42203127.

The product of its digits is 241920, while the sum is 43.

The spelling of 221734651318 in words is "two hundred twenty-one billion, seven hundred thirty-four million, six hundred fifty-one thousand, three hundred eighteen".