221221311004 has 24 divisors (see below), whose sum is σ = 392979459600. Its totient is φ = 108942003456.

The previous prime is 221221310977. The next prime is 221221311041. The reversal of 221221311004 is 400113122122.

It is a congruent number.

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, 1664334 + ... + 1792330.

It is an arithmetic number, because the mean of its divisors is an integer number (16374144150).

Almost surely, 2^221221311004 is an apocalyptic number.

It is an amenable number.

221221311004 is a deficient number, since it is larger than the sum of its proper divisors (171758148596).

221221311004 is a wasteful number, since it uses less digits than its factorization.

221221311004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134517 (or 134515 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 221221311004 its reverse (400113122122), we get a palindrome (621334433126).

The spelling of 221221311004 in words is "two hundred twenty-one billion, two hundred twenty-one million, three hundred eleven thousand, four".