211121011221121 has 4 divisors (see below), whose sum is σ = 211121082505152. Its totient is φ = 211120939937092.

The previous prime is 211121011221101. The next prime is 211121011221181. The reversal of 211121011221121 is 121122110121112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 211121011221121 - 2¹³ = 211121011212929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211121011221101) 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, 30997765 + ... + 37190098.

It is an arithmetic number, because the mean of its divisors is an integer number (52780270626288).

Almost surely, 2^{211121011221121} is an apocalyptic number.

It is an amenable number.

211121011221121 is a deficient number, since it is larger than the sum of its proper divisors (71284031).

211121011221121 is an equidigital number, since it uses as much as digits as its factorization.

211121011221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71284030.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 211121011221121 its reverse (121122110121112), we get a palindrome (332243121342233).

The spelling of 211121011221121 in words is "two hundred eleven trillion, one hundred twenty-one billion, eleven million, two hundred twenty-one thousand, one hundred twenty-one".