1043242021 has 2 divisors, whose sum is σ = 1043242022. Its totient is φ = 1043242020.

The previous prime is 1043242003. The next prime is 1043242037. The reversal of 1043242021 is 1202423401.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 551733121 + 491508900 = 23489^2 + 22170^2 .

It is an emirp because it is prime and its reverse (1202423401) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1043242021 - 2⁹ = 1043241509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1043242021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1043242061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 521621010 + 521621011.

It is an arithmetic number, because the mean of its divisors is an integer number (521621011).

Almost surely, 2^1043242021 is an apocalyptic number.

It is an amenable number.

1043242021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1043242021 is an equidigital number, since it uses as much as digits as its factorization.

1043242021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1043242021 is about 32299.2572824825. The cubic root of 1043242021 is about 1014.2110951075.

Adding to 1043242021 its reverse (1202423401), we get a palindrome (2245665422).

The spelling of 1043242021 in words is "one billion, forty-three million, two hundred forty-two thousand, twenty-one".