505050921 has 24 divisors (see below), whose sum is σ = 762041280. Its totient is φ = 321916896.

The previous prime is 505050907. The next prime is 505050937. The reversal of 505050921 is 129050505.

It is not a de Polignac number, because 505050921 - 2¹⁸ = 504788777 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (505050961) 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, 17490 + ... + 36276.

It is an arithmetic number, because the mean of its divisors is an integer number (31751720).

Almost surely, 2^505050921 is an apocalyptic number.

It is an amenable number.

505050921 is a deficient number, since it is larger than the sum of its proper divisors (256990359).

505050921 is a wasteful number, since it uses less digits than its factorization.

505050921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18925 (or 18922 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 27.

The square root of 505050921 is about 22473.3380030649. The cubic root of 505050921 is about 796.3641891526.

The spelling of 505050921 in words is "five hundred five million, fifty thousand, nine hundred twenty-one".