210111211201021 has 8 divisors (see below), whose sum is σ = 229373250585080. Its totient is φ = 191291977320192.

The previous prime is 210111211200967. The next prime is 210111211201039. The reversal of 210111211201021 is 120102112111012.

It can be written as a sum of positive squares in 4 ways, for example, as 60459784296921 + 149651426904100 = 7775589^2 + 12233210^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210111211201021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210111211200986 and 210111211201004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210111211301021) 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, 110701374816 + ... + 110701376713.

It is an arithmetic number, because the mean of its divisors is an integer number (28671656323135).

Almost surely, 2^{210111211201021} is an apocalyptic number.

It is an amenable number.

210111211201021 is a deficient number, since it is larger than the sum of its proper divisors (19262039384059).

210111211201021 is a wasteful number, since it uses less digits than its factorization.

210111211201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221402751615.

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

Adding to 210111211201021 its reverse (120102112111012), we get a palindrome (330213323312033).

Subtracting from 210111211201021 its reverse (120102112111012), we obtain a palindrome (90009099090009).

The spelling of 210111211201021 in words is "two hundred ten trillion, one hundred eleven billion, two hundred eleven million, two hundred one thousand, twenty-one".