499211721 has 16 divisors (see below), whose sum is σ = 749992320. Its totient is φ = 328119120.

The previous prime is 499211701. The next prime is 499211723. The reversal of 499211721 is 127112994.

It is not a de Polignac number, because 499211721 - 2¹¹ = 499209673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (499211723) 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, 128290 + ... + 132123.

It is an arithmetic number, because the mean of its divisors is an integer number (46874520).

Almost surely, 2^499211721 is an apocalyptic number.

It is an amenable number.

499211721 is a deficient number, since it is larger than the sum of its proper divisors (250780599).

499211721 is a wasteful number, since it uses less digits than its factorization.

499211721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260493 (or 260487 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 499211721 is about 22343.0463679419. The cubic root of 499211721 is about 793.2832016239.

The spelling of 499211721 in words is "four hundred ninety-nine million, two hundred eleven thousand, seven hundred twenty-one".