121021111001 has 4 divisors (see below), whose sum is σ = 138309841152. Its totient is φ = 103732380852.

The previous prime is 121021110997. The next prime is 121021111027. The reversal of 121021111001 is 100111120121.

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: 100111120121 = 9833 ⋅10181137.

It is a cyclic number.

It is not a de Polignac number, because 121021111001 - 2² = 121021110997 is a prime.

It is a super-2 number, since 2×121021111001² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121021111031) 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, 8644365065 + ... + 8644365078.

It is an arithmetic number, because the mean of its divisors is an integer number (34577460288).

Almost surely, 2^121021111001 is an apocalyptic number.

It is an amenable number.

121021111001 is a deficient number, since it is larger than the sum of its proper divisors (17288730151).

121021111001 is an equidigital number, since it uses as much as digits as its factorization.

121021111001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17288730150.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 121021111001 its reverse (100111120121), we get a palindrome (221132231122).

The spelling of 121021111001 in words is "one hundred twenty-one billion, twenty-one million, one hundred eleven thousand, one".