1101123421 has 2 divisors, whose sum is σ = 1101123422. Its totient is φ = 1101123420.

The previous prime is 1101123377. The next prime is 1101123427. The reversal of 1101123421 is 1243211011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 867950521 + 233172900 = 29461^2 + 15270^2 .

It is a cyclic number.

It is not a de Polignac number, because 1101123421 - 2¹⁹ = 1100599133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1101123395 and 1101123404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1101123427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550561710 + 550561711.

It is an arithmetic number, because the mean of its divisors is an integer number (550561711).

Almost surely, 2^1101123421 is an apocalyptic number.

It is an amenable number.

1101123421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1101123421 is an equidigital number, since it uses as much as digits as its factorization.

1101123421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 1101123421 is about 33183.1797903697. The cubic root of 1101123421 is about 1032.6314156355.

Adding to 1101123421 its reverse (1243211011), we get a palindrome (2344334432).

The spelling of 1101123421 in words is "one billion, one hundred one million, one hundred twenty-three thousand, four hundred twenty-one".