1200001012101 has 24 divisors (see below), whose sum is σ = 1744271553024. Its totient is φ = 794956005600.

The previous prime is 1200001012099. The next prime is 1200001012103. The reversal of 1200001012101 is 1012101000021.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1200001012099) and next prime (1200001012103).

It is not a de Polignac number, because 1200001012101 - 2¹ = 1200001012099 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200001012103) 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, 4633951 + ... + 4886051.

It is an arithmetic number, because the mean of its divisors is an integer number (72677981376).

Almost surely, 2^{1200001012101} is an apocalyptic number.

It is an amenable number.

1200001012101 is a deficient number, since it is larger than the sum of its proper divisors (544270540923).

1200001012101 is a wasteful number, since it uses less digits than its factorization.

1200001012101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255441 (or 255438 counting only the distinct ones).

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

Adding to 1200001012101 its reverse (1012101000021), we get a palindrome (2212102012122).

The spelling of 1200001012101 in words is "one trillion, two hundred billion, one million, twelve thousand, one hundred one".