121200010011 has 12 divisors (see below), whose sum is σ = 175069736088. Its totient is φ = 80798596704.

The previous prime is 121200010003. The next prime is 121200010027. The reversal of 121200010011 is 110010002121.

It is a happy number.

It is not a de Polignac number, because 121200010011 - 2³ = 121200010003 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 = 121200009975 and 121200010002.

It is not an unprimeable number, because it can be changed into a prime (121200010031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 823791 + ... + 959703.

It is an arithmetic number, because the mean of its divisors is an integer number (14589144674).

Almost surely, 2^121200010011 is an apocalyptic number.

121200010011 is a deficient number, since it is larger than the sum of its proper divisors (53869726077).

121200010011 is a wasteful number, since it uses less digits than its factorization.

121200010011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235002 (or 234999 counting only the distinct ones).

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

Adding to 121200010011 its reverse (110010002121), we get a palindrome (231210012132).

The spelling of 121200010011 in words is "one hundred twenty-one billion, two hundred million, ten thousand, eleven".