121101221221 has 4 divisors (see below), whose sum is σ = 122054774272. Its totient is φ = 120147668172.

The previous prime is 121101221183. The next prime is 121101221239. The reversal of 121101221221 is 122122101121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122122101121 = 181 ⋅674707741.

It is a cyclic number.

It is not a de Polignac number, because 121101221221 - 2³⁵ = 86741482853 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121101221195 and 121101221204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121101221251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 476776335 + ... + 476776588.

It is an arithmetic number, because the mean of its divisors is an integer number (30513693568).

Almost surely, 2^121101221221 is an apocalyptic number.

It is an amenable number.

121101221221 is a deficient number, since it is larger than the sum of its proper divisors (953553051).

121101221221 is an equidigital number, since it uses as much as digits as its factorization.

121101221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953553050.

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

Adding to 121101221221 its reverse (122122101121), we get a palindrome (243223322342).

The spelling of 121101221221 in words is "one hundred twenty-one billion, one hundred one million, two hundred twenty-one thousand, two hundred twenty-one".