501252221 has 4 divisors (see below), whose sum is σ = 504327552. Its totient is φ = 498176892.

The previous prime is 501252197. The next prime is 501252239. The reversal of 501252221 is 122252105.

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 501252221 - 2²⁶ = 434143357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 501252193 and 501252202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (501252421) 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, 1537421 + ... + 1537746.

It is an arithmetic number, because the mean of its divisors is an integer number (126081888).

Almost surely, 2^501252221 is an apocalyptic number.

It is an amenable number.

501252221 is a deficient number, since it is larger than the sum of its proper divisors (3075331).

501252221 is a wasteful number, since it uses less digits than its factorization.

501252221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3075330.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 501252221 is about 22388.6627782903. The cubic root of 501252221 is about 794.3625659220.

The spelling of 501252221 in words is "five hundred one million, two hundred fifty-two thousand, two hundred twenty-one".