503129421 has 8 divisors (see below), whose sum is σ = 745376960. Its totient is φ = 335419596.

The previous prime is 503129413. The next prime is 503129447. The reversal of 503129421 is 124921305.

It is not a de Polignac number, because 503129421 - 2³ = 503129413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 18634423 = 503129421 / (5 + 0 + 3 + 1 + 2 + 9 + 4 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (503129461) 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, 9317185 + ... + 9317238.

It is an arithmetic number, because the mean of its divisors is an integer number (93172120).

Almost surely, 2^503129421 is an apocalyptic number.

It is an amenable number.

503129421 is a deficient number, since it is larger than the sum of its proper divisors (242247539).

503129421 is a wasteful number, since it uses less digits than its factorization.

503129421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18634432 (or 18634426 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 503129421 is about 22430.5466050206. The cubic root of 503129421 is about 795.3529653742.

The spelling of 503129421 in words is "five hundred three million, one hundred twenty-nine thousand, four hundred twenty-one".