121200001011 has 24 divisors (see below), whose sum is σ = 179872533360. Its totient is φ = 78583715136.

The previous prime is 121200001009. The next prime is 121200001019. The reversal of 121200001011 is 110100002121.

It is a happy number.

It is not a de Polignac number, because 121200001011 - 2¹ = 121200001009 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 = 121200000984 and 121200001002.

It is not an unprimeable number, because it can be changed into a prime (121200001019) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 744841 + ... + 892853.

It is an arithmetic number, because the mean of its divisors is an integer number (7494688890).

Almost surely, 2^121200001011 is an apocalyptic number.

121200001011 is a deficient number, since it is larger than the sum of its proper divisors (58672532349).

121200001011 is a wasteful number, since it uses less digits than its factorization.

121200001011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150515 (or 150512 counting only the distinct ones).

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

Adding to 121200001011 its reverse (110100002121), we get a palindrome (231300003132).

The spelling of 121200001011 in words is "one hundred twenty-one billion, two hundred million, one thousand, eleven".