211121102220121 has 4 divisors (see below), whose sum is σ = 212783473103872. Its totient is φ = 209458731336372.

The previous prime is 211121102220089. The next prime is 211121102220209. The reversal of 211121102220121 is 121022201121112.

It is a happy number.

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 211121102220121 - 2⁵ = 211121102220089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211121102221121) 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, 831185441685 + ... + 831185441938.

It is an arithmetic number, because the mean of its divisors is an integer number (53195868275968).

Almost surely, 2^{211121102220121} is an apocalyptic number.

It is an amenable number.

211121102220121 is a deficient number, since it is larger than the sum of its proper divisors (1662370883751).

211121102220121 is a wasteful number, since it uses less digits than its factorization.

211121102220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1662370883750.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 211121102220121 its reverse (121022201121112), we get a palindrome (332143303341233).

The spelling of 211121102220121 in words is "two hundred eleven trillion, one hundred twenty-one billion, one hundred two million, two hundred twenty thousand, one hundred twenty-one".