221021012204 has 12 divisors (see below), whose sum is σ = 409538934504. Its totient is φ = 104009888064.

The previous prime is 221021012203. The next prime is 221021012249. The reversal of 221021012204 is 402210120122.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is not an unprimeable number, because it can be changed into a prime (221021012203) 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, 1625154434 + ... + 1625154569.

It is an arithmetic number, because the mean of its divisors is an integer number (34128244542).

Almost surely, 2^221021012204 is an apocalyptic number.

It is an amenable number.

221021012204 is a deficient number, since it is larger than the sum of its proper divisors (188517922300).

221021012204 is a wasteful number, since it uses less digits than its factorization.

221021012204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3250309024 (or 3250309022 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 221021012204 its reverse (402210120122), we get a palindrome (623231132326).

The spelling of 221021012204 in words is "two hundred twenty-one billion, twenty-one million, twelve thousand, two hundred four".