1202011100021 has 2 divisors, whose sum is σ = 1202011100022. Its totient is φ = 1202011100020.

The previous prime is 1202011099999. The next prime is 1202011100029. The reversal of 1202011100021 is 1200011102021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 909951919396 + 292059180625 = 953914^2 + 540425^2 .

It is a cyclic number.

It is not a de Polignac number, because 1202011100021 - 2¹⁸ = 1202010837877 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1202011099975 and 1202011100011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1202011100029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 601005550010 + 601005550011.

It is an arithmetic number, because the mean of its divisors is an integer number (601005550011).

Almost surely, 2^{1202011100021} is an apocalyptic number.

It is an amenable number.

1202011100021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1202011100021 is an equidigital number, since it uses as much as digits as its factorization.

1202011100021 is an odious number, because the sum of its binary digits is odd.

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

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

The spelling of 1202011100021 in words is "one trillion, two hundred two billion, eleven million, one hundred thousand, twenty-one".