121212112021221 has 8 divisors (see below), whose sum is σ = 174048160851040. Its totient is φ = 74592068936112.

The previous prime is 121212112021201. The next prime is 121212112021261. The reversal of 121212112021221 is 122120211212121.

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

It is not a de Polignac number, because 121212112021221 - 2²¹ = 121212109924069 is a prime.

It is a super-2 number, since 2×121212112021221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212112021201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1554001436131 + ... + 1554001436208.

It is an arithmetic number, because the mean of its divisors is an integer number (21756020106380).

Almost surely, 2^{121212112021221} is an apocalyptic number.

It is an amenable number.

121212112021221 is a deficient number, since it is larger than the sum of its proper divisors (52836048829819).

121212112021221 is a wasteful number, since it uses less digits than its factorization.

121212112021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3108002872355.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 121212112021221 its reverse (122120211212121), we get a palindrome (243332323233342).

The spelling of 121212112021221 in words is "one hundred twenty-one trillion, two hundred twelve billion, one hundred twelve million, twenty-one thousand, two hundred twenty-one".