221450501 has 4 divisors (see below), whose sum is σ = 221493792. Its totient is φ = 221407212.

The previous prime is 221450497. The next prime is 221450503. The reversal of 221450501 is 105054122.

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 221450501 - 2² = 221450497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221450503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12755 + ... + 24608.

It is an arithmetic number, because the mean of its divisors is an integer number (55373448).

Almost surely, 2^221450501 is an apocalyptic number.

It is an amenable number.

221450501 is a deficient number, since it is larger than the sum of its proper divisors (43291).

221450501 is an equidigital number, since it uses as much as digits as its factorization.

221450501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43290.

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

The square root of 221450501 is about 14881.2130217936. The cubic root of 221450501 is about 605.0048958008.

The spelling of 221450501 in words is "two hundred twenty-one million, four hundred fifty thousand, five hundred one".