121111111021001 has 4 divisors (see below), whose sum is σ = 123687943170432. Its totient is φ = 118534278871572.

The previous prime is 121111111020943. The next prime is 121111111021003. The reversal of 121111111021001 is 100120111111121.

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.

It is a cyclic number.

It is not a de Polignac number, because 121111111021001 - 2²⁶ = 121111043912137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121111111021003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1288416074645 + ... + 1288416074738.

It is an arithmetic number, because the mean of its divisors is an integer number (30921985792608).

Almost surely, 2^{121111111021001} is an apocalyptic number.

It is an amenable number.

121111111021001 is a deficient number, since it is larger than the sum of its proper divisors (2576832149431).

121111111021001 is an equidigital number, since it uses as much as digits as its factorization.

121111111021001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2576832149430.

The product of its (nonzero) digits is 4, while the sum is 14.

Adding to 121111111021001 its reverse (100120111111121), we get a palindrome (221231222132122).

The spelling of 121111111021001 in words is "one hundred twenty-one trillion, one hundred eleven billion, one hundred eleven million, twenty-one thousand, one".