201000111021 has 48 divisors (see below), whose sum is σ = 301495993344. Its totient is φ = 128930890752.

The previous prime is 201000111017. The next prime is 201000111043. The reversal of 201000111021 is 120111000102.

It is a happy number.

It is not a de Polignac number, because 201000111021 - 2² = 201000111017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 201000110994 and 201000111012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201000111061) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 79039276 + ... + 79041818.

It is an arithmetic number, because the mean of its divisors is an integer number (6281166528).

Almost surely, 2^201000111021 is an apocalyptic number.

It is an amenable number.

201000111021 is a deficient number, since it is larger than the sum of its proper divisors (100495882323).

201000111021 is a wasteful number, since it uses less digits than its factorization.

201000111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5130 (or 5127 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 201000111021 its reverse (120111000102), we get a palindrome (321111111123).

The spelling of 201000111021 in words is "two hundred one billion, one hundred eleven thousand, twenty-one".