12121000001001 has 20 divisors (see below), whose sum is σ = 18106933680000. Its totient is φ = 8080553014776.

The previous prime is 12121000000999. The next prime is 12121000001017. The reversal of 12121000001001 is 10010000012121.

It is a happy number.

It is not a de Polignac number, because 12121000001001 - 2¹ = 12121000000999 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 (12121000001041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4952500 + ... + 6983498.

It is an arithmetic number, because the mean of its divisors is an integer number (905346684000).

Almost surely, 2^{12121000001001} is an apocalyptic number.

It is an amenable number.

12121000001001 is a deficient number, since it is larger than the sum of its proper divisors (5985933678999).

12121000001001 is an equidigital number, since it uses as much as digits as its factorization.

12121000001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2104690 (or 2104681 counting only the distinct ones).

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

Adding to 12121000001001 its reverse (10010000012121), we get a palindrome (22131000013122).

The spelling of 12121000001001 in words is "twelve trillion, one hundred twenty-one billion, one thousand, one".