201020111021 has 8 divisors (see below), whose sum is σ = 222098946624. Its totient is φ = 180969511360.

The previous prime is 201020110997. The next prime is 201020111053. The reversal of 201020111021 is 120111020102.

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 201020111021 - 2⁶ = 201020110957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201020110993 and 201020111011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201020111821) 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, 257058575 + ... + 257059356.

It is an arithmetic number, because the mean of its divisors is an integer number (27762368328).

Almost surely, 2^201020111021 is an apocalyptic number.

It is an amenable number.

201020111021 is a deficient number, since it is larger than the sum of its proper divisors (21078835603).

201020111021 is a wasteful number, since it uses less digits than its factorization.

201020111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514117971.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 201020111021 its reverse (120111020102), we get a palindrome (321131131123).

The spelling of 201020111021 in words is "two hundred one billion, twenty million, one hundred eleven thousand, twenty-one".