11420121109 has 2 divisors, whose sum is σ = 11420121110. Its totient is φ = 11420121108.

The previous prime is 11420121101. The next prime is 11420121113. The reversal of 11420121109 is 90112102411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11387024100 + 33097009 = 106710^2 + 5753^2 .

It is a cyclic number.

It is not a de Polignac number, because 11420121109 - 2³ = 11420121101 is a prime.

It is a super-2 number, since 2×11420121109² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11420121109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11420121101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5710060554 + 5710060555.

It is an arithmetic number, because the mean of its divisors is an integer number (5710060555).

Almost surely, 2^11420121109 is an apocalyptic number.

It is an amenable number.

11420121109 is a deficient number, since it is larger than the sum of its proper divisors (1).

11420121109 is an equidigital number, since it uses as much as digits as its factorization.

11420121109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 11420121109 in words is "eleven billion, four hundred twenty million, one hundred twenty-one thousand, one hundred nine".