211110212010121 has 4 divisors (see below), whose sum is σ = 211476087594772. Its totient is φ = 210744336425472.

The previous prime is 211110212010079. The next prime is 211110212010241. The reversal of 211110212010121 is 121010212011112.

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 155437184828025 + 55673027182096 = 12467445^2 + 7461436^2 .

It is a cyclic number.

It is not a de Polignac number, because 211110212010121 - 2⁷ = 211110212009993 is a prime.

It is a super-2 number, since 2×211110212010121² (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 = 211110212010095 and 211110212010104.

It is not an unprimeable number, because it can be changed into a prime (211110212040121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182937791460 + ... + 182937792613.

It is an arithmetic number, because the mean of its divisors is an integer number (52869021898693).

Almost surely, 2^{211110212010121} is an apocalyptic number.

It is an amenable number.

211110212010121 is a deficient number, since it is larger than the sum of its proper divisors (365875584651).

211110212010121 is an equidigital number, since it uses as much as digits as its factorization.

211110212010121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365875584650.

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

Adding to 211110212010121 its reverse (121010212011112), we get a palindrome (332120424021233).

Subtracting from 211110212010121 its reverse (121010212011112), we obtain a palindrome (90099999999009).

The spelling of 211110212010121 in words is "two hundred eleven trillion, one hundred ten billion, two hundred twelve million, ten thousand, one hundred twenty-one".