121222122121221 has 8 divisors (see below), whose sum is σ = 176323086721824. Its totient is φ = 73467952800720.

The previous prime is 121222122121211. The next prime is 121222122121279. The reversal of 121222122121221 is 122121221222121.

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

It is not a de Polignac number, because 121222122121221 - 2²³ = 121222113732613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121222122121191 and 121222122121200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121222122121211) 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, 1836698819986 + ... + 1836698820051.

It is an arithmetic number, because the mean of its divisors is an integer number (22040385840228).

Almost surely, 2^{121222122121221} is an apocalyptic number.

121222122121221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121222122121221 is a deficient number, since it is larger than the sum of its proper divisors (55100964600603).

121222122121221 is a wasteful number, since it uses less digits than its factorization.

121222122121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3673397640051.

The product of its digits is 512, while the sum is 24.

Adding to 121222122121221 its reverse (122121221222121), we get a palindrome (243343343343342).

The spelling of 121222122121221 in words is "one hundred twenty-one trillion, two hundred twenty-two billion, one hundred twenty-two million, one hundred twenty-one thousand, two hundred twenty-one".