11211120010021 has 2 divisors, whose sum is σ = 11211120010022. Its totient is φ = 11211120010020.

The previous prime is 11211120009941. The next prime is 11211120010061. The reversal of 11211120010021 is 12001002111211.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10636821279396 + 574298730625 = 3261414^2 + 757825^2 .

It is an emirp because it is prime and its reverse (12001002111211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11211120010021 - 2⁷ = 11211120009893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11211120009983 and 11211120010010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11211120010061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605560005010 + 5605560005011.

It is an arithmetic number, because the mean of its divisors is an integer number (5605560005011).

Almost surely, 2^{11211120010021} is an apocalyptic number.

It is an amenable number.

11211120010021 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211120010021 is an equidigital number, since it uses as much as digits as its factorization.

11211120010021 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 13.

Adding to 11211120010021 its reverse (12001002111211), we get a palindrome (23212122121232).

It can be divided in two parts, 11211 and 120010021, that multiplied together give a palindrome (1345432345431).

The spelling of 11211120010021 in words is "eleven trillion, two hundred eleven billion, one hundred twenty million, ten thousand, twenty-one".