202221110021 has 12 divisors (see below), whose sum is σ = 249074261388. Its totient is φ = 163136356992.

The previous prime is 202221109991. The next prime is 202221110029. The reversal of 202221110021 is 120011122202.

It can be written as a sum of positive squares in 2 ways, for example, as 71259633025 + 130961476996 = 266945^2 + 361886^2 .

It is not a de Polignac number, because 202221110021 - 2¹⁴ = 202221093637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202221109978 and 202221110005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202221110029) 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, 121380386 + ... + 121382051.

It is an arithmetic number, because the mean of its divisors is an integer number (20756188449).

Almost surely, 2^202221110021 is an apocalyptic number.

It is an amenable number.

202221110021 is a deficient number, since it is larger than the sum of its proper divisors (46853151367).

202221110021 is a wasteful number, since it uses less digits than its factorization.

202221110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242762468 (or 242762461 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 202221110021 its reverse (120011122202), we get a palindrome (322232232223).

The spelling of 202221110021 in words is "two hundred two billion, two hundred twenty-one million, one hundred ten thousand, twenty-one".