121100001001 has 16 divisors (see below), whose sum is σ = 141896055168. Its totient is φ = 101182262400.

The previous prime is 121100000977. The next prime is 121100001013. The reversal of 121100001001 is 100100001121.

It is a cyclic number.

It is not a de Polignac number, because 121100001001 - 2³¹ = 118952517353 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (7).

It is not an unprimeable number, because it can be changed into a prime (121100001401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160306 + ... + 517588.

It is an arithmetic number, because the mean of its divisors is an integer number (8868503448).

Almost surely, 2^121100001001 is an apocalyptic number.

It is an amenable number.

121100001001 is a deficient number, since it is larger than the sum of its proper divisors (20796054167).

121100001001 is a wasteful number, since it uses less digits than its factorization.

121100001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358512.

The product of its (nonzero) digits is 2, while the sum is 7.

Adding to 121100001001 its reverse (100100001121), we get a palindrome (221200002122).

The spelling of 121100001001 in words is "one hundred twenty-one billion, one hundred million, one thousand, one".