1021200100011 has 144 divisors (see below), whose sum is σ = 1870880741184. Its totient is φ = 522687541248.

The previous prime is 1021200100009. The next prime is 1021200100021. The reversal of 1021200100011 is 1100010021201.

It is a happy number.

It is not a de Polignac number, because 1021200100011 - 2¹ = 1021200100009 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 1021200099966 and 1021200100002.

It is not an unprimeable number, because it can be changed into a prime (1021200100001) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 512392431 + ... + 512394423.

Almost surely, 2^{1021200100011} is an apocalyptic number.

1021200100011 is a deficient number, since it is larger than the sum of its proper divisors (849680641173).

1021200100011 is a wasteful number, since it uses less digits than its factorization.

1021200100011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2550 (or 2510 counting only the distinct ones).

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

Adding to 1021200100011 its reverse (1100010021201), we get a palindrome (2121210121212).

It can be divided in two parts, 1021200 and 100011, that added together give a palindrome (1121211).

The spelling of 1021200100011 in words is "one trillion, twenty-one billion, two hundred million, one hundred thousand, eleven".