221312221004 has 12 divisors (see below), whose sum is σ = 442624442064. Its totient is φ = 94848094704.

The previous prime is 221312221003. The next prime is 221312221043. The reversal of 221312221004 is 400122213122.

221312221004 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (221312221003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3952003919 + ... + 3952003974.

It is an arithmetic number, because the mean of its divisors is an integer number (36885370172).

Almost surely, 2^221312221004 is an apocalyptic number.

It is an amenable number.

221312221004 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221312221004 is a wasteful number, since it uses less digits than its factorization.

221312221004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7904007904 (or 7904007902 counting only the distinct ones).

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

Adding to 221312221004 its reverse (400122213122), we get a palindrome (621434434126).

The spelling of 221312221004 in words is "two hundred twenty-one billion, three hundred twelve million, two hundred twenty-one thousand, four".