121220332421 has 16 divisors (see below), whose sum is σ = 122883070464. Its totient is φ = 119568307824.

The previous prime is 121220332361. The next prime is 121220332477. The reversal of 121220332421 is 124233022121.

It is a cyclic number.

It is not a de Polignac number, because 121220332421 - 2¹⁴ = 121220316037 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 (121220332621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50027816 + ... + 50030238.

It is an arithmetic number, because the mean of its divisors is an integer number (7680191904).

Almost surely, 2^121220332421 is an apocalyptic number.

It is an amenable number.

121220332421 is a deficient number, since it is larger than the sum of its proper divisors (1662738043).

121220332421 is a wasteful number, since it uses less digits than its factorization.

121220332421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4360.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 121220332421 its reverse (124233022121), we get a palindrome (245453354542).

The spelling of 121220332421 in words is "one hundred twenty-one billion, two hundred twenty million, three hundred thirty-two thousand, four hundred twenty-one".