10111120120021 has 2 divisors, whose sum is σ = 10111120120022. Its totient is φ = 10111120120020.

The previous prime is 10111120119983. The next prime is 10111120120043. The reversal of 10111120120021 is 12002102111101.

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., 6074179222225 + 4036940897796 = 2464585^2 + 2009214^2 .

It is an emirp because it is prime and its reverse (12002102111101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10111120120021 - 2⁹ = 10111120119509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10111120119983 and 10111120120010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10111120120061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5055560060010 + 5055560060011.

It is an arithmetic number, because the mean of its divisors is an integer number (5055560060011).

Almost surely, 2^{10111120120021} is an apocalyptic number.

It is an amenable number.

10111120120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

10111120120021 is an equidigital number, since it uses as much as digits as its factorization.

10111120120021 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 13.

Adding to 10111120120021 its reverse (12002102111101), we get a palindrome (22113222231122).

The spelling of 10111120120021 in words is "ten trillion, one hundred eleven billion, one hundred twenty million, one hundred twenty thousand, twenty-one".