121121012222221 has 32 divisors (see below), whose sum is σ = 139419876556800. Its totient is φ = 104064630094080.

The previous prime is 121121012222137. The next prime is 121121012222261. The reversal of 121121012222221 is 122222210121121.

It is a cyclic number.

It is not a de Polignac number, because 121121012222221 - 2²⁷ = 121120878004493 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121121012222192 and 121121012222201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121121012222261) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1145548660 + ... + 1145654386.

It is an arithmetic number, because the mean of its divisors is an integer number (4356871142400).

Almost surely, 2^{121121012222221} is an apocalyptic number.

121121012222221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121121012222221 is a deficient number, since it is larger than the sum of its proper divisors (18298864334579).

121121012222221 is a wasteful number, since it uses less digits than its factorization.

121121012222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118849.

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 121121012222221 its reverse (122222210121121), we get a palindrome (243343222343342).

It can be divided in two parts, 1211210 and 12222221, that added together give a palindrome (13433431).

The spelling of 121121012222221 in words is "one hundred twenty-one trillion, one hundred twenty-one billion, twelve million, two hundred twenty-two thousand, two hundred twenty-one".