211211101102021 has 4 divisors (see below), whose sum is σ = 216362591372844. Its totient is φ = 206059610831200.

The previous prime is 211211101101989. The next prime is 211211101102051. The reversal of 211211101102021 is 120201101112112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 105486662248900 + 105724438853121 = 10270670^2 + 10282239^2 .

It is a cyclic number.

It is not a de Polignac number, because 211211101102021 - 2⁵ = 211211101101989 is a prime.

It is a super-2 number, since 2×211211101102021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211211101101986 and 211211101102004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211211101102051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2575745135350 + ... + 2575745135431.

It is an arithmetic number, because the mean of its divisors is an integer number (54090647843211).

Almost surely, 2^{211211101102021} is an apocalyptic number.

It is an amenable number.

211211101102021 is a deficient number, since it is larger than the sum of its proper divisors (5151490270823).

211211101102021 is an equidigital number, since it uses as much as digits as its factorization.

211211101102021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5151490270822.

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

Adding to 211211101102021 its reverse (120201101112112), we get a palindrome (331412202214133).

The spelling of 211211101102021 in words is "two hundred eleven trillion, two hundred eleven billion, one hundred one million, one hundred two thousand, twenty-one".