1105142021 has 2 divisors, whose sum is σ = 1105142022. Its totient is φ = 1105142020.

The previous prime is 1105141993. The next prime is 1105142023. The reversal of 1105142021 is 1202415011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 856732900 + 248409121 = 29270^2 + 15761^2 .

It is a cyclic number.

It is not a de Polignac number, because 1105142021 - 2¹⁰ = 1105140997 is a prime.

Together with 1105142023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1105142023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 552571010 + 552571011.

It is an arithmetic number, because the mean of its divisors is an integer number (552571011).

Almost surely, 2^1105142021 is an apocalyptic number.

It is an amenable number.

1105142021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1105142021 is an equidigital number, since it uses as much as digits as its factorization.

1105142021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 1105142021 is about 33243.6764061979. The cubic root of 1105142021 is about 1033.8861022963.

Adding to 1105142021 its reverse (1202415011), we get a palindrome (2307557032).

The spelling of 1105142021 in words is "one billion, one hundred five million, one hundred forty-two thousand, twenty-one".