1200012110021 has 4 divisors (see below), whose sum is σ = 1201597331532. Its totient is φ = 1198426888512.

The previous prime is 1200012109987. The next prime is 1200012110023. The reversal of 1200012110021 is 1200112100021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 504057400900 + 695954709121 = 709970^2 + 834239^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1200012110021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1200012109984 and 1200012110011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200012110023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 792609620 + ... + 792611133.

It is an arithmetic number, because the mean of its divisors is an integer number (300399332883).

Almost surely, 2^{1200012110021} is an apocalyptic number.

It is an amenable number.

1200012110021 is a deficient number, since it is larger than the sum of its proper divisors (1585221511).

1200012110021 is an equidigital number, since it uses as much as digits as its factorization.

1200012110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1585221510.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1200012110021 its reverse (1200112100021), we get a palindrome (2400124210042).

The spelling of 1200012110021 in words is "one trillion, two hundred billion, twelve million, one hundred ten thousand, twenty-one".