201021020221111 has 4 divisors (see below), whose sum is σ = 201032540728000. Its totient is φ = 201009499714224.

The previous prime is 201021020221079. The next prime is 201021020221181. The reversal of 201021020221111 is 111122020120102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 201021020221111 - 2⁵ = 201021020221079 is a prime.

It is a super-4 number, since 4×201021020221111⁴ (a number of 58 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021020221181) 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, 5760227271 + ... + 5760262168.

It is an arithmetic number, because the mean of its divisors is an integer number (50258135182000).

Almost surely, 2^{201021020221111} is an apocalyptic number.

201021020221111 is a deficient number, since it is larger than the sum of its proper divisors (11520506889).

201021020221111 is a wasteful number, since it uses less digits than its factorization.

201021020221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11520506888.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 201021020221111 its reverse (111122020120102), we get a palindrome (312143040341213).

The spelling of 201021020221111 in words is "two hundred one trillion, twenty-one billion, twenty million, two hundred twenty-one thousand, one hundred eleven".