211021021111121 has 8 divisors (see below), whose sum is σ = 227257305297960. Its totient is φ = 194785293773952.

The previous prime is 211021021111099. The next prime is 211021021111139. The reversal of 211021021111121 is 121111120120112.

It can be written as a sum of positive squares in 4 ways, for example, as 15029113027600 + 195991908083521 = 3876740^2 + 13999711^2 .

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-211021021111121 is a prime.

It is a super-2 number, since 2×211021021111121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 211021021111121.

It is not an unprimeable number, because it can be changed into a prime (211021021111151) 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 7 ways as a sum of consecutive naturals, for example, 138425186 + ... + 139941323.

It is an arithmetic number, because the mean of its divisors is an integer number (28407163162245).

Almost surely, 2^{211021021111121} is an apocalyptic number.

It is an amenable number.

211021021111121 is a deficient number, since it is larger than the sum of its proper divisors (16236284186839).

211021021111121 is a wasteful number, since it uses less digits than its factorization.

211021021111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278424835.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 211021021111121 its reverse (121111120120112), we get a palindrome (332132141231233).

The spelling of 211021021111121 in words is "two hundred eleven trillion, twenty-one billion, twenty-one million, one hundred eleven thousand, one hundred twenty-one".