221110201021 has 8 divisors (see below), whose sum is σ = 234125710200. Its totient is φ = 208095694848.

The previous prime is 221110201003. The next prime is 221110201051. The reversal of 221110201021 is 120102011122.

It can be written as a sum of positive squares in 4 ways, for example, as 8838068121 + 212272132900 = 94011^2 + 460730^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221110201021 - 2⁵ = 221110200989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221110200992 and 221110201010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221110201051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 229405 + ... + 703453.

It is an arithmetic number, because the mean of its divisors is an integer number (29265713775).

Almost surely, 2^221110201021 is an apocalyptic number.

It is an amenable number.

221110201021 is a deficient number, since it is larger than the sum of its proper divisors (13015509179).

221110201021 is a wasteful number, since it uses less digits than its factorization.

221110201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501503.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 221110201021 its reverse (120102011122), we get a palindrome (341212212143).

The spelling of 221110201021 in words is "two hundred twenty-one billion, one hundred ten million, two hundred one thousand, twenty-one".