721414521 has 12 divisors (see below), whose sum is σ = 1042400320. Its totient is φ = 480778200.

The previous prime is 721414489. The next prime is 721414531. The reversal of 721414521 is 125414127.

721414521 is a `hidden beast` number, since 72 + 141 + 452 + 1 = 666.

It is not a de Polignac number, because 721414521 - 2⁵ = 721414489 is a prime.

It is a super-2 number, since 2×721414521² = 1040877822219318882, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (721414531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17796 + ... + 41946.

Almost surely, 2^721414521 is an apocalyptic number.

It is an amenable number.

721414521 is a deficient number, since it is larger than the sum of its proper divisors (320985799).

721414521 is a wasteful number, since it uses less digits than its factorization.

721414521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27476 (or 27473 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 721414521 is about 26859.1608394603. The cubic root of 721414521 is about 896.8675136073.

Adding to 721414521 its reverse (125414127), we get a palindrome (846828648).

The spelling of 721414521 in words is "seven hundred twenty-one million, four hundred fourteen thousand, five hundred twenty-one".