121121101 has 4 divisors (see below), whose sum is σ = 122827104. Its totient is φ = 119415100.

The previous prime is 121121083. The next prime is 121121113. The reversal of 121121101 is 101121121.

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: 101121121 = 1619 ⋅62459.

It is a cyclic number.

It is not a de Polignac number, because 121121101 - 2¹⁵ = 121088333 is a prime.

It is a super-3 number, since 3×121121101³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121121191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 852895 + ... + 853036.

It is an arithmetic number, because the mean of its divisors is an integer number (30706776).

Almost surely, 2^121121101 is an apocalyptic number.

It is an amenable number.

121121101 is a deficient number, since it is larger than the sum of its proper divisors (1706003).

121121101 is an equidigital number, since it uses as much as digits as its factorization.

121121101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1706002.

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 121121101 is about 11005.5032143015. The cubic root of 121121101 is about 494.7736965070.

Adding to 121121101 its reverse (101121121), we get a palindrome (222242222).

It can be divided in two parts, 121121 and 101, that multiplied together give a palindrome (12233221).

The spelling of 121121101 in words is "one hundred twenty-one million, one hundred twenty-one thousand, one hundred one".