221001221098 has 24 divisors (see below), whose sum is σ = 398921984100. Its totient is φ = 91448779968.

The previous prime is 221001221087. The next prime is 221001221099. The reversal of 221001221098 is 890122100122.

It can be written as a sum of positive squares in 2 ways, for example, as 207337247649 + 13663973449 = 455343^2 + 116893^2 .

It is not an unprimeable number, because it can be changed into a prime (221001221099) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38878443 + ... + 38884126.

Almost surely, 2^221001221098 is an apocalyptic number.

221001221098 is a deficient number, since it is larger than the sum of its proper divisors (177920763002).

221001221098 is a wasteful number, since it uses less digits than its factorization.

221001221098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77762614 (or 77762607 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The spelling of 221001221098 in words is "two hundred twenty-one billion, one million, two hundred twenty-one thousand, ninety-eight".