201022020221 has 4 divisors (see below), whose sum is σ = 219296749344. Its totient is φ = 182747291100.

The previous prime is 201022020169. The next prime is 201022020263. The reversal of 201022020221 is 122020220102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 201022020221 - 2²² = 201017825917 is a prime.

It is a super-2 number, since 2×201022020221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201022020196 and 201022020205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201022020721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9137364545 + ... + 9137364566.

It is an arithmetic number, because the mean of its divisors is an integer number (54824187336).

Almost surely, 2^201022020221 is an apocalyptic number.

It is an amenable number.

201022020221 is a deficient number, since it is larger than the sum of its proper divisors (18274729123).

201022020221 is a wasteful number, since it uses less digits than its factorization.

201022020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18274729122.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 201022020221 its reverse (122020220102), we get a palindrome (323042240323).

The spelling of 201022020221 in words is "two hundred one billion, twenty-two million, twenty thousand, two hundred twenty-one".