121201121211 has 4 divisors (see below), whose sum is σ = 161601494952. Its totient is φ = 80800747472.

The previous prime is 121201121191. The next prime is 121201121221. The reversal of 121201121211 is 112121102121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121201121211 - 2⁶ = 121201121147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121201121221) 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, 20200186866 + ... + 20200186871.

It is an arithmetic number, because the mean of its divisors is an integer number (40400373738).

Almost surely, 2^121201121211 is an apocalyptic number.

121201121211 is a deficient number, since it is larger than the sum of its proper divisors (40400373741).

121201121211 is an equidigital number, since it uses as much as digits as its factorization.

121201121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40400373740.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 121201121211 its reverse (112121102121), we get a palindrome (233322223332).

The spelling of 121201121211 in words is "one hundred twenty-one billion, two hundred one million, one hundred twenty-one thousand, two hundred eleven".