210111201021 has 32 divisors (see below), whose sum is σ = 299714103936. Its totient is φ = 130464000000.

The previous prime is 210111201017. The next prime is 210111201029. The reversal of 210111201021 is 120102111012.

It is not a de Polignac number, because 210111201021 - 2² = 210111201017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210111200988 and 210111201006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210111201029) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11585841 + ... + 11603961.

It is an arithmetic number, because the mean of its divisors is an integer number (9366065748).

Almost surely, 2^210111201021 is an apocalyptic number.

It is an amenable number.

210111201021 is a deficient number, since it is larger than the sum of its proper divisors (89602902915).

210111201021 is a wasteful number, since it uses less digits than its factorization.

210111201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20493.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 210111201021 its reverse (120102111012), we get a palindrome (330213312033).

Subtracting from 210111201021 its reverse (120102111012), we obtain a palindrome (90009090009).

The spelling of 210111201021 in words is "two hundred ten billion, one hundred eleven million, two hundred one thousand, twenty-one".