11201121989 has 2 divisors, whose sum is σ = 11201121990. Its totient is φ = 11201121988.

The previous prime is 11201121979. The next prime is 11201122001. The reversal of 11201121989 is 98912110211.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10126396900 + 1074725089 = 100630^2 + 32783^2 .

It is a cyclic number.

It is not a de Polignac number, because 11201121989 - 2²⁰ = 11200073413 is a prime.

It is a super-2 number, since 2×11201121989² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11201121979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5600560994 + 5600560995.

It is an arithmetic number, because the mean of its divisors is an integer number (5600560995).

Almost surely, 2^11201121989 is an apocalyptic number.

It is an amenable number.

11201121989 is a deficient number, since it is larger than the sum of its proper divisors (1).

11201121989 is an equidigital number, since it uses as much as digits as its factorization.

11201121989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 35.

The spelling of 11201121989 in words is "eleven billion, two hundred one million, one hundred twenty-one thousand, nine hundred eighty-nine".