121212021121 has 16 divisors (see below), whose sum is σ = 129334449600. Its totient is φ = 113272344000.

The previous prime is 121212021097. The next prime is 121212021163. The reversal of 121212021121 is 121120212121.

It is a cyclic number.

It is not a de Polignac number, because 121212021121 - 2²⁹ = 120675150209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121212021095 and 121212021104.

It is not an unprimeable number, because it can be changed into a prime (121212021221) 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, 398806 + ... + 633616.

It is an arithmetic number, because the mean of its divisors is an integer number (8083403100).

Almost surely, 2^121212021121 is an apocalyptic number.

It is an amenable number.

121212021121 is a deficient number, since it is larger than the sum of its proper divisors (8122428479).

121212021121 is a wasteful number, since it uses less digits than its factorization.

121212021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235200.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 121212021121 its reverse (121120212121), we get a palindrome (242332233242).

The spelling of 121212021121 in words is "one hundred twenty-one billion, two hundred twelve million, twenty-one thousand, one hundred twenty-one".