505122021 has 16 divisors (see below), whose sum is σ = 780865920. Its totient is φ = 322106400.

The previous prime is 505121999. The next prime is 505122043. The reversal of 505122021 is 120221505.

It is an interprime number because it is at equal distance from previous prime (505121999) and next prime (505122043).

It is not a de Polignac number, because 505122021 - 2⁶ = 505121957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 505121985 and 505122003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505122221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 406080 + ... + 407321.

It is an arithmetic number, because the mean of its divisors is an integer number (48804120).

Almost surely, 2^505122021 is an apocalyptic number.

It is an amenable number.

505122021 is a deficient number, since it is larger than the sum of its proper divisors (275743899).

505122021 is a wasteful number, since it uses less digits than its factorization.

505122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813433 (or 813427 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 505122021 is about 22474.9198218815. The cubic root of 505122021 is about 796.4015575543.

Adding to 505122021 its reverse (120221505), we get a palindrome (625343526).

It can be divided in two parts, 5051 and 22021, that added together give a palindrome (27072).

The spelling of 505122021 in words is "five hundred five million, one hundred twenty-two thousand, twenty-one".