121002101001 has 12 divisors (see below), whose sum is σ = 174810883312. Its totient is φ = 80654188536.

The previous prime is 121002100997. The next prime is 121002101039. The reversal of 121002101001 is 100101200121.

It is a happy number.

It is not a de Polignac number, because 121002101001 - 2² = 121002100997 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121002101081) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1101211 + ... + 1206096.

Almost surely, 2^121002101001 is an apocalyptic number.

It is an amenable number.

121002101001 is a deficient number, since it is larger than the sum of its proper divisors (53808782311).

121002101001 is a wasteful number, since it uses less digits than its factorization.

121002101001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2313140 (or 2313137 counting only the distinct ones).

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

Adding to 121002101001 its reverse (100101200121), we get a palindrome (221103301122).

The spelling of 121002101001 in words is "one hundred twenty-one billion, two million, one hundred one thousand, one".