505050021 has 24 divisors (see below), whose sum is σ = 834372864. Its totient is φ = 288378720.

The previous prime is 505049983. The next prime is 505050043. The reversal of 505050021 is 120050505.

It is not a de Polignac number, because 505050021 - 2⁹ = 505049509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 505049976 and 505050003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505050521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 116116 + ... + 120386.

It is an arithmetic number, because the mean of its divisors is an integer number (34765536).

Almost surely, 2^505050021 is an apocalyptic number.

It is an amenable number.

505050021 is a deficient number, since it is larger than the sum of its proper divisors (329322843).

505050021 is a wasteful number, since it uses less digits than its factorization.

505050021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6161 (or 6158 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 18.

The square root of 505050021 is about 22473.3179793283. The cubic root of 505050021 is about 796.3637161124.

The spelling of 505050021 in words is "five hundred five million, fifty thousand, twenty-one".