1021240043 has 4 divisors (see below), whose sum is σ = 1065641808. Its totient is φ = 976838280.

The previous prime is 1021239977. The next prime is 1021240081. The reversal of 1021240043 is 3400421201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3400421201 = 8819 ⋅385579.

It is a cyclic number.

It is not a de Polignac number, because 1021240043 - 2⁸ = 1021239787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021240343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22200848 + ... + 22200893.

It is an arithmetic number, because the mean of its divisors is an integer number (266410452).

Almost surely, 2^1021240043 is an apocalyptic number.

1021240043 is a deficient number, since it is larger than the sum of its proper divisors (44401765).

1021240043 is an equidigital number, since it uses as much as digits as its factorization.

1021240043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44401764.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 1021240043 is about 31956.8465747170. The cubic root of 1021240043 is about 1007.0304709782.

Adding to 1021240043 its reverse (3400421201), we get a palindrome (4421661244).

The spelling of 1021240043 in words is "one billion, twenty-one million, two hundred forty thousand, forty-three".