1100115421 has 2 divisors, whose sum is σ = 1100115422. Its totient is φ = 1100115420.

The previous prime is 1100115391. The next prime is 1100115431. The reversal of 1100115421 is 1245110011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 923491321 + 176624100 = 30389^2 + 13290^2 .

It is a cyclic number.

It is not a de Polignac number, because 1100115421 - 2¹¹ = 1100113373 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1100115395 and 1100115404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1100115431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550057710 + 550057711.

It is an arithmetic number, because the mean of its divisors is an integer number (550057711).

Almost surely, 2^1100115421 is an apocalyptic number.

It is an amenable number.

1100115421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1100115421 is an equidigital number, since it uses as much as digits as its factorization.

1100115421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40, while the sum is 16.

The square root of 1100115421 is about 33167.9878949568. The cubic root of 1100115421 is about 1032.3162192855.

Adding to 1100115421 its reverse (1245110011), we get a palindrome (2345225432).

The spelling of 1100115421 in words is "one billion, one hundred million, one hundred fifteen thousand, four hundred twenty-one".