121111220021211 has 24 divisors (see below), whose sum is σ = 199930253402880. Its totient is φ = 69206196703536.

The previous prime is 121111220021177. The next prime is 121111220021251. The reversal of 121111220021211 is 112120022111121.

It is a happy number.

121111220021211 is a `hidden beast` number, since 1 + 211 + 1 + 1 + 220 + 0 + 21 + 211 = 666.

It is not a de Polignac number, because 121111220021211 - 2²³ = 121111211632603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121111220021251) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18726856 + ... + 24349898.

It is an arithmetic number, because the mean of its divisors is an integer number (8330427225120).

Almost surely, 2^{121111220021211} is an apocalyptic number.

121111220021211 is a deficient number, since it is larger than the sum of its proper divisors (78819033381669).

121111220021211 is a wasteful number, since it uses less digits than its factorization.

121111220021211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5964935 (or 5964932 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 121111220021211 its reverse (112120022111121), we get a palindrome (233231242132332).

The spelling of 121111220021211 in words is "one hundred twenty-one trillion, one hundred eleven billion, two hundred twenty million, twenty-one thousand, two hundred eleven".