121251321221 has 8 divisors (see below), whose sum is σ = 121641663264. Its totient is φ = 120861124560.

The previous prime is 121251321209. The next prime is 121251321227. The reversal of 121251321221 is 122123152121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121251321221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121251321227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1779446 + ... + 1846328.

It is an arithmetic number, because the mean of its divisors is an integer number (15205207908).

Almost surely, 2^121251321221 is an apocalyptic number.

It is an amenable number.

121251321221 is a deficient number, since it is larger than the sum of its proper divisors (390342043).

121251321221 is an equidigital number, since it uses as much as digits as its factorization.

121251321221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72691.

The product of its digits is 480, while the sum is 23.

Adding to 121251321221 its reverse (122123152121), we get a palindrome (243374473342).

The spelling of 121251321221 in words is "one hundred twenty-one billion, two hundred fifty-one million, three hundred twenty-one thousand, two hundred twenty-one".