221221020004 has 12 divisors (see below), whose sum is σ = 392037251200. Its totient is φ = 109210376808.

The previous prime is 221221019993. The next prime is 221221020173. The reversal of 221221020004 is 400020122122.

It is a super-2 number, since 2×221221020004² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221221020004.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 350032944 + ... + 350033575.

Almost surely, 2^221221020004 is an apocalyptic number.

It is an amenable number.

221221020004 is a deficient number, since it is larger than the sum of its proper divisors (170816231196).

221221020004 is a wasteful number, since it uses less digits than its factorization.

221221020004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700066602 (or 700066600 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 221221020004 its reverse (400020122122), we get a palindrome (621241142126).

The spelling of 221221020004 in words is "two hundred twenty-one billion, two hundred twenty-one million, twenty thousand, four".