121321220011 has 4 divisors (see below), whose sum is σ = 127706547400. Its totient is φ = 114935892624.

The previous prime is 121321219997. The next prime is 121321220017. The reversal of 121321220011 is 110022123121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 110022123121 = 19 ⋅5790638059.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121321220011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121321220017) 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, 3192663666 + ... + 3192663703.

It is an arithmetic number, because the mean of its divisors is an integer number (31926636850).

Almost surely, 2^121321220011 is an apocalyptic number.

121321220011 is a deficient number, since it is larger than the sum of its proper divisors (6385327389).

121321220011 is an equidigital number, since it uses as much as digits as its factorization.

121321220011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6385327388.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 121321220011 its reverse (110022123121), we get a palindrome (231343343132).

The spelling of 121321220011 in words is "one hundred twenty-one billion, three hundred twenty-one million, two hundred twenty thousand, eleven".