1003020421 has 8 divisors (see below), whose sum is σ = 1085775320. Its totient is φ = 921065472.

The previous prime is 1003020413. The next prime is 1003020427. The reversal of 1003020421 is 1240203001.

It can be written as a sum of positive squares in 4 ways, for example, as 41152225 + 961868196 = 6415^2 + 31014^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1003020421 - 2³ = 1003020413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1003020427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197376 + ... + 202393.

It is an arithmetic number, because the mean of its divisors is an integer number (135721915).

Almost surely, 2^1003020421 is an apocalyptic number.

It is an amenable number.

1003020421 is a deficient number, since it is larger than the sum of its proper divisors (82754899).

1003020421 is a wasteful number, since it uses less digits than its factorization.

1003020421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399975.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 1003020421 is about 31670.4976437062. The cubic root of 1003020421 is about 1001.0057950372.

Adding to 1003020421 its reverse (1240203001), we get a palindrome (2243223422).

The spelling of 1003020421 in words is "one billion, three million, twenty thousand, four hundred twenty-one".