221556223042 has 32 divisors (see below), whose sum is σ = 420014807424. Its totient is φ = 85138128000.

The previous prime is 221556223013. The next prime is 221556223043. The reversal of 221556223042 is 240322655122.

221556223042 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 221556222989 and 221556223007.

It is not an unprimeable number, because it can be changed into a prime (221556223043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9842709 + ... + 9865192.

It is an arithmetic number, because the mean of its divisors is an integer number (13125462732).

Almost surely, 2^221556223042 is an apocalyptic number.

221556223042 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221556223042 is a deficient number, since it is larger than the sum of its proper divisors (198458584382).

221556223042 is a wasteful number, since it uses less digits than its factorization.

221556223042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19707994.

The product of its (nonzero) digits is 57600, while the sum is 34.

Adding to 221556223042 its reverse (240322655122), we get a palindrome (461878878164).

The spelling of 221556223042 in words is "two hundred twenty-one billion, five hundred fifty-six million, two hundred twenty-three thousand, forty-two".