121210421121 has 24 divisors (see below), whose sum is σ = 178471042880. Its totient is φ = 79253181216.

The previous prime is 121210421117. The next prime is 121210421149. The reversal of 121210421121 is 121124012121.

121210421121 is a `hidden beast` number, since 1 + 2 + 121 + 0 + 421 + 121 = 666.

It is not a de Polignac number, because 121210421121 - 2² = 121210421117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121210421094 and 121210421103.

It is not an unprimeable number, because it can be changed into a prime (121210422121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 300805 + ... + 576978.

Almost surely, 2^121210421121 is an apocalyptic number.

It is an amenable number.

121210421121 is a deficient number, since it is larger than the sum of its proper divisors (57260621759).

121210421121 is a wasteful number, since it uses less digits than its factorization.

121210421121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878085 (or 878082 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 121210421121 its reverse (121124012121), we get a palindrome (242334433242).

The spelling of 121210421121 in words is "one hundred twenty-one billion, two hundred ten million, four hundred twenty-one thousand, one hundred twenty-one".