1020240421 has 4 divisors (see below), whose sum is σ = 1041947712. Its totient is φ = 998533132.

The previous prime is 1020240413. The next prime is 1020240427. The reversal of 1020240421 is 1240420201.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1240420201 = 701 ⋅1769501.

It is a cyclic number.

It is not a de Polignac number, because 1020240421 - 2³ = 1020240413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020240395 and 1020240404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020240427) 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, 10853575 + ... + 10853668.

It is an arithmetic number, because the mean of its divisors is an integer number (260486928).

Almost surely, 2^1020240421 is an apocalyptic number.

It is an amenable number.

1020240421 is a deficient number, since it is larger than the sum of its proper divisors (21707291).

1020240421 is an equidigital number, since it uses as much as digits as its factorization.

1020240421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21707290.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 1020240421 is about 31941.2025603295. The cubic root of 1020240421 is about 1006.7017926406.

Adding to 1020240421 its reverse (1240420201), we get a palindrome (2260660622).

The spelling of 1020240421 in words is "one billion, twenty million, two hundred forty thousand, four hundred twenty-one".