505235650251221 has 4 divisors (see below), whose sum is σ = 527202417653472. Its totient is φ = 483268882848972.

The previous prime is 505235650251217. The next prime is 505235650251257. The reversal of 505235650251221 is 122152056532505.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 505235650251221 - 2² = 505235650251217 is a prime.

It is a super-2 number, since 2×505235650251221² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505235650251421) 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, 10983383701091 + ... + 10983383701136.

It is an arithmetic number, because the mean of its divisors is an integer number (131800604413368).

Almost surely, 2^{505235650251221} is an apocalyptic number.

It is an amenable number.

505235650251221 is a deficient number, since it is larger than the sum of its proper divisors (21966767402251).

505235650251221 is a wasteful number, since it uses less digits than its factorization.

505235650251221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21966767402250.

The product of its (nonzero) digits is 900000, while the sum is 44.

The spelling of 505235650251221 in words is "five hundred five trillion, two hundred thirty-five billion, six hundred fifty million, two hundred fifty-one thousand, two hundred twenty-one".