121122111221 has 8 divisors (see below), whose sum is σ = 127510034400. Its totient is φ = 114735495600.

The previous prime is 121122111217. The next prime is 121122111233. The reversal of 121122111221 is 122111221121.

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

It is a cyclic number.

It is not a de Polignac number, because 121122111221 - 2² = 121122111217 is a prime.

It is a super-2 number, since 2×121122111221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 121122111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121122111211) 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, 133811 + ... + 510048.

It is an arithmetic number, because the mean of its divisors is an integer number (15938754300).

Almost surely, 2^121122111221 is an apocalyptic number.

It is an amenable number.

121122111221 is a deficient number, since it is larger than the sum of its proper divisors (6387923179).

121122111221 is an equidigital number, since it uses as much as digits as its factorization.

121122111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653779.

The product of its digits is 32, while the sum is 17.

Adding to 121122111221 its reverse (122111221121), we get a palindrome (243233332342).

It can be divided in two parts, 121 and 122111221, that multiplied together give a palindrome (14775457741).

The spelling of 121122111221 in words is "one hundred twenty-one billion, one hundred twenty-two million, one hundred eleven thousand, two hundred twenty-one".