121000120001001 has 32 divisors (see below), whose sum is σ = 185642583456000. Its totient is φ = 77800384376064.

The previous prime is 121000120000979. The next prime is 121000120001011. The reversal of 121000120001001 is 100100021000121.

It is a happy number.

It is not a de Polignac number, because 121000120001001 - 2¹⁰ = 121000119999977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (121000120001011) 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, 83357680 + ... + 84796833.

It is an arithmetic number, because the mean of its divisors is an integer number (5801330733000).

Almost surely, 2^{121000120001001} is an apocalyptic number.

It is an amenable number.

121000120001001 is a deficient number, since it is larger than the sum of its proper divisors (64642463454999).

121000120001001 is a wasteful number, since it uses less digits than its factorization.

121000120001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168155470 (or 168155464 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 121000120001001 its reverse (100100021000121), we get a palindrome (221100141001122).

The spelling of 121000120001001 in words is "one hundred twenty-one trillion, one hundred twenty million, one thousand, one".