1021442401 has 4 divisors (see below), whose sum is σ = 1167362752. Its totient is φ = 875522052.

The previous prime is 1021442393. The next prime is 1021442431. The reversal of 1021442401 is 1042441201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1021442401 - 2³ = 1021442393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021442431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72960165 + ... + 72960178.

It is an arithmetic number, because the mean of its divisors is an integer number (291840688).

Almost surely, 2^1021442401 is an apocalyptic number.

It is an amenable number.

1021442401 is a deficient number, since it is larger than the sum of its proper divisors (145920351).

1021442401 is an equidigital number, since it uses as much as digits as its factorization.

1021442401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145920350.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 1021442401 is about 31960.0125312867. The cubic root of 1021442401 is about 1007.0969807132.

Adding to 1021442401 its reverse (1042441201), we get a palindrome (2063883602).

The spelling of 1021442401 in words is "one billion, twenty-one million, four hundred forty-two thousand, four hundred one".