121002100011 has 12 divisors (see below), whose sum is σ = 188225489088. Its totient is φ = 74462830704.

The previous prime is 121002099997. The next prime is 121002100069. The reversal of 121002100011 is 110001200121.

It is a happy number.

It is not a de Polignac number, because 121002100011 - 2⁶ = 121002099947 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 121002099966 and 121002100002.

It is not an unprimeable number, because it can be changed into a prime (121002100211) 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, 517102875 + ... + 517103108.

It is an arithmetic number, because the mean of its divisors is an integer number (15685457424).

Almost surely, 2^121002100011 is an apocalyptic number.

121002100011 is a deficient number, since it is larger than the sum of its proper divisors (67223389077).

121002100011 is a wasteful number, since it uses less digits than its factorization.

121002100011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1034206002 (or 1034205999 counting only the distinct ones).

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

Adding to 121002100011 its reverse (110001200121), we get a palindrome (231003300132).

The spelling of 121002100011 in words is "one hundred twenty-one billion, two million, one hundred thousand, eleven".