499220821 has 4 divisors (see below), whose sum is σ = 544604544. Its totient is φ = 453837100.

The previous prime is 499220783. The next prime is 499220851. The reversal of 499220821 is 128022994.

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 499220821 - 2⁷ = 499220693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (499220851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22691845 + ... + 22691866.

It is an arithmetic number, because the mean of its divisors is an integer number (136151136).

Almost surely, 2^499220821 is an apocalyptic number.

It is an amenable number.

499220821 is a deficient number, since it is larger than the sum of its proper divisors (45383723).

499220821 is a wasteful number, since it uses less digits than its factorization.

499220821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45383722.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 499220821 is about 22343.2500097904. The cubic root of 499220821 is about 793.2880217787.

The spelling of 499220821 in words is "four hundred ninety-nine million, two hundred twenty thousand, eight hundred twenty-one".