210021000111 has 48 divisors (see below), whose sum is σ = 327811839264. Its totient is φ = 128804412672.

The previous prime is 210021000089. The next prime is 210021000149. The reversal of 210021000111 is 111000120012.

It is a happy number.

It is not a de Polignac number, because 210021000111 - 2⁷ = 210020999983 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 = 210021000093 and 210021000102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210021000811) 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, 46493425 + ... + 46497941.

It is an arithmetic number, because the mean of its divisors is an integer number (6829413318).

Almost surely, 2^210021000111 is an apocalyptic number.

210021000111 is a deficient number, since it is larger than the sum of its proper divisors (117790839153).

210021000111 is a wasteful number, since it uses less digits than its factorization.

210021000111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5800 (or 5797 counting only the distinct ones).

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

Adding to 210021000111 its reverse (111000120012), we get a palindrome (321021120123).

The spelling of 210021000111 in words is "two hundred ten billion, twenty-one million, one hundred eleven", and thus it is an aban number.