221400242042 has 16 divisors (see below), whose sum is σ = 399519234240. Its totient is φ = 89891827488.

The previous prime is 221400241981. The next prime is 221400242047. The reversal of 221400242042 is 240242004122.

It is a junction number, because it is equal to n+sod(n) for n = 221400241999 and 221400242017.

It is not an unprimeable number, because it can be changed into a prime (221400242047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 416165603 + ... + 416166134.

It is an arithmetic number, because the mean of its divisors is an integer number (24969952140).

Almost surely, 2^221400242042 is an apocalyptic number.

221400242042 is a deficient number, since it is larger than the sum of its proper divisors (178118992198).

221400242042 is a wasteful number, since it uses less digits than its factorization.

221400242042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832331765.

The product of its (nonzero) digits is 2048, while the sum is 23.

Adding to 221400242042 its reverse (240242004122), we get a palindrome (461642246164).

The spelling of 221400242042 in words is "two hundred twenty-one billion, four hundred million, two hundred forty-two thousand, forty-two".