1200010100121 has 32 divisors (see below), whose sum is σ = 2033249863680. Its totient is φ = 685218285648.

The previous prime is 1200010100119. The next prime is 1200010100141. The reversal of 1200010100121 is 1210010100021.

It is a happy number.

It is not a de Polignac number, because 1200010100121 - 2¹ = 1200010100119 is a prime.

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 (1200010100141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2063971 + ... + 2580696.

It is an arithmetic number, because the mean of its divisors is an integer number (63539058240).

Almost surely, 2^{1200010100121} is an apocalyptic number.

It is an amenable number.

1200010100121 is a deficient number, since it is larger than the sum of its proper divisors (833239763559).

1200010100121 is a wasteful number, since it uses less digits than its factorization.

1200010100121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4646050 (or 4646044 counting only the distinct ones).

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

Adding to 1200010100121 its reverse (1210010100021), we get a palindrome (2410020200142).

The spelling of 1200010100121 in words is "one trillion, two hundred billion, ten million, one hundred thousand, one hundred twenty-one".