121121121111001 has 32 divisors (see below), whose sum is σ = 134594840236032. Its totient is φ = 108078399000000.

The previous prime is 121121121110947. The next prime is 121121121111047. The reversal of 121121121111001 is 100111121121121.

It is a de Polignac number, because none of the positive numbers 2^k-121121121111001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121121121111101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 143811246 + ... + 144651016.

It is an arithmetic number, because the mean of its divisors is an integer number (4206088757376).

Almost surely, 2^{121121121111001} is an apocalyptic number.

121121121111001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121121121111001 is a deficient number, since it is larger than the sum of its proper divisors (13473719125031).

121121121111001 is a wasteful number, since it uses less digits than its factorization.

121121121111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841005.

The product of its (nonzero) digits is 8, while the sum is 16.

Adding to 121121121111001 its reverse (100111121121121), we get a palindrome (221232242232122).

The spelling of 121121121111001 in words is "one hundred twenty-one trillion, one hundred twenty-one billion, one hundred twenty-one million, one hundred eleven thousand, one".