1200100112021 has 2 divisors, whose sum is σ = 1200100112022. Its totient is φ = 1200100112020.

The previous prime is 1200100112017. The next prime is 1200100112041. The reversal of 1200100112021 is 1202110010021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1192269631921 + 7830480100 = 1091911^2 + 88490^2 .

It is an emirp because it is prime and its reverse (1202110010021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1200100112021 - 2² = 1200100112017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1200100111993 and 1200100112011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200100112041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600050056010 + 600050056011.

It is an arithmetic number, because the mean of its divisors is an integer number (600050056011).

Almost surely, 2^{1200100112021} is an apocalyptic number.

It is an amenable number.

1200100112021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200100112021 is an equidigital number, since it uses as much as digits as its factorization.

1200100112021 is an evil number, because the sum of its binary digits is even.

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

Adding to 1200100112021 its reverse (1202110010021), we get a palindrome (2402210122042).

The spelling of 1200100112021 in words is "one trillion, two hundred billion, one hundred million, one hundred twelve thousand, twenty-one".