1040421021 has 4 divisors (see below), whose sum is σ = 1387228032. Its totient is φ = 693614012.

The previous prime is 1040421017. The next prime is 1040421049. The reversal of 1040421021 is 1201240401.

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 1040421021 - 2² = 1040421017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1040421071) 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, 173403501 + ... + 173403506.

It is an arithmetic number, because the mean of its divisors is an integer number (346807008).

Almost surely, 2^1040421021 is an apocalyptic number.

It is an amenable number.

1040421021 is a deficient number, since it is larger than the sum of its proper divisors (346807011).

1040421021 is an equidigital number, since it uses as much as digits as its factorization.

1040421021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346807010.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 1040421021 is about 32255.5579861828. The cubic root of 1040421021 is about 1013.2961037679.

Adding to 1040421021 its reverse (1201240401), we get a palindrome (2241661422).

The spelling of 1040421021 in words is "one billion, forty million, four hundred twenty-one thousand, twenty-one".