221221034232442 has 16 divisors (see below), whose sum is σ = 331877784880872. Its totient is φ = 110595106702080.

The previous prime is 221221034232409. The next prime is 221221034232491. The reversal of 221221034232442 is 244232430122122.

It can be written as a sum of positive squares in 4 ways, for example, as 217880360514441 + 3340673718001 = 14760771^2 + 1827751^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221221034232398 and 221221034232407.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 656552478 + ... + 656889334.

Almost surely, 2^{221221034232442} is an apocalyptic number.

221221034232442 is a deficient number, since it is larger than the sum of its proper divisors (110656750648430).

221221034232442 is a wasteful number, since it uses less digits than its factorization.

221221034232442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381633.

The product of its (nonzero) digits is 73728, while the sum is 34.

Adding to 221221034232442 its reverse (244232430122122), we get a palindrome (465453464354564).

The spelling of 221221034232442 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, thirty-four million, two hundred thirty-two thousand, four hundred forty-two".