221432144776746 has 8 divisors (see below), whose sum is σ = 442864289553504. Its totient is φ = 73810714925580.

The previous prime is 221432144776699. The next prime is 221432144776747. The reversal of 221432144776746 is 647677441234122.

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

221432144776746 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 221432144776746.

It is not an unprimeable number, because it can be changed into a prime (221432144776747) 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, 18452678731390 + ... + 18452678731401.

It is an arithmetic number, because the mean of its divisors is an integer number (55358036194188).

Almost surely, 2^{221432144776746} is an apocalyptic number.

221432144776746 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221432144776746 is a wasteful number, since it uses less digits than its factorization.

221432144776746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36905357462796.

The product of its digits is 75866112, while the sum is 60.

The spelling of 221432144776746 in words is "two hundred twenty-one trillion, four hundred thirty-two billion, one hundred forty-four million, seven hundred seventy-six thousand, seven hundred forty-six".