121220142401 has 4 divisors (see below), whose sum is σ = 121220893872. Its totient is φ = 121219390932.

The previous prime is 121220142383. The next prime is 121220142403. The reversal of 121220142401 is 104241022121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121220142401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121220142403) 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, 24035 + ... + 492968.

It is an arithmetic number, because the mean of its divisors is an integer number (30305223468).

Almost surely, 2^121220142401 is an apocalyptic number.

It is an amenable number.

121220142401 is a deficient number, since it is larger than the sum of its proper divisors (751471).

121220142401 is an equidigital number, since it uses as much as digits as its factorization.

121220142401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 751470.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 121220142401 its reverse (104241022121), we get a palindrome (225461164522).

The spelling of 121220142401 in words is "one hundred twenty-one billion, two hundred twenty million, one hundred forty-two thousand, four hundred one".