121331321221 has 16 divisors (see below), whose sum is σ = 132875043840. Its totient is φ = 109873991920.

The previous prime is 121331321179. The next prime is 121331321239. The reversal of 121331321221 is 122123133121.

It is not a de Polignac number, because 121331321221 - 2²¹ = 121329224069 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121331321192 and 121331321201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121331321261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3128676 + ... + 3167218.

It is an arithmetic number, because the mean of its divisors is an integer number (8304690240).

Almost surely, 2^121331321221 is an apocalyptic number.

121331321221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121331321221 is a deficient number, since it is larger than the sum of its proper divisors (11543722619).

121331321221 is a wasteful number, since it uses less digits than its factorization.

121331321221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39656.

The product of its digits is 432, while the sum is 22.

Adding to 121331321221 its reverse (122123133121), we get a palindrome (243454454342).

The spelling of 121331321221 in words is "one hundred twenty-one billion, three hundred thirty-one million, three hundred twenty-one thousand, two hundred twenty-one".