221203021124 has 24 divisors (see below), whose sum is σ = 394448441688. Its totient is φ = 108503882240.

The previous prime is 221203021121. The next prime is 221203021181. The reversal of 221203021124 is 421120302122.

It can be written as a sum of positive squares in 4 ways, for example, as 158618992900 + 62584028224 = 398270^2 + 250168^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221203021096 and 221203021105.

It is not an unprimeable number, because it can be changed into a prime (221203021121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2341004 + ... + 2433660.

It is an arithmetic number, because the mean of its divisors is an integer number (16435351737).

Almost surely, 2^221203021124 is an apocalyptic number.

It is an amenable number.

221203021124 is a deficient number, since it is larger than the sum of its proper divisors (173245420564).

221203021124 is a wasteful number, since it uses less digits than its factorization.

221203021124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103975 (or 103973 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 221203021124 its reverse (421120302122), we get a palindrome (642323323246).

The spelling of 221203021124 in words is "two hundred twenty-one billion, two hundred three million, twenty-one thousand, one hundred twenty-four".