1020421403 has 4 divisors (see below), whose sum is σ = 1024801128. Its totient is φ = 1016041680.

The previous prime is 1020421393. The next prime is 1020421411. The reversal of 1020421403 is 3041240201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1020421403 - 2⁴ = 1020421387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020421453) 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, 2189513 + ... + 2189978.

It is an arithmetic number, because the mean of its divisors is an integer number (256200282).

Almost surely, 2^1020421403 is an apocalyptic number.

1020421403 is a deficient number, since it is larger than the sum of its proper divisors (4379725).

1020421403 is an equidigital number, since it uses as much as digits as its factorization.

1020421403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4379724.

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

The square root of 1020421403 is about 31944.0354839522. The cubic root of 1020421403 is about 1006.7613159084.

Adding to 1020421403 its reverse (3041240201), we get a palindrome (4061661604).

The spelling of 1020421403 in words is "one billion, twenty million, four hundred twenty-one thousand, four hundred three".