1200011102021 has 6 divisors (see below), whose sum is σ = 1218189042630. Its totient is φ = 1182100484136.

The previous prime is 1200011102011. The next prime is 1200011102053. The reversal of 1200011102021 is 1202011100021.

It can be written as a sum of positive squares in only one way, i.e., 1150620928900 + 49390173121 = 1072670^2 + 222239^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1200011102021 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 = 1200011101993 and 1200011102011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200011102011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 133656806 + ... + 133665783.

It is an arithmetic number, because the mean of its divisors is an integer number (203031507105).

Almost surely, 2^{1200011102021} is an apocalyptic number.

It is an amenable number.

1200011102021 is a deficient number, since it is larger than the sum of its proper divisors (18177940609).

1200011102021 is an frugal number, since it uses more digits than its factorization.

1200011102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267322723 (or 267322656 counting only the distinct ones).

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

Adding to 1200011102021 its reverse (1202011100021), we get a palindrome (2402022202042).

The spelling of 1200011102021 in words is "one trillion, two hundred billion, eleven million, one hundred two thousand, twenty-one".