121002011001 has 32 divisors (see below), whose sum is σ = 194436547200. Its totient is φ = 74071042560.

The previous prime is 121002010993. The next prime is 121002011017. The reversal of 121002011001 is 100110200121.

It is a happy number.

It is not a de Polignac number, because 121002011001 - 2³ = 121002010993 is a prime.

It is a super-2 number, since 2×121002011001² (a number of 23 digits) contains 22 as substring.

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 (121002011021) 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, 3196071 + ... + 3233708.

It is an arithmetic number, because the mean of its divisors is an integer number (6076142100).

Almost surely, 2^121002011001 is an apocalyptic number.

It is an amenable number.

121002011001 is a deficient number, since it is larger than the sum of its proper divisors (73434536199).

121002011001 is a wasteful number, since it uses less digits than its factorization.

121002011001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6429846 (or 6429840 counting only the distinct ones).

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

Adding to 121002011001 its reverse (100110200121), we get a palindrome (221112211122).

The spelling of 121002011001 in words is "one hundred twenty-one billion, two million, eleven thousand, one".