721414421 has 16 divisors (see below), whose sum is σ = 906791424. Its totient is φ = 558641664.

The previous prime is 721414409. The next prime is 721414453. The reversal of 721414421 is 124414127.

It is not a de Polignac number, because 721414421 - 2⁶ = 721414357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721414621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80060 + ... + 88613.

It is an arithmetic number, because the mean of its divisors is an integer number (56674464).

Almost surely, 2^721414421 is an apocalyptic number.

It is an amenable number.

721414421 is a deficient number, since it is larger than the sum of its proper divisors (185377003).

721414421 is a wasteful number, since it uses less digits than its factorization.

721414421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168740.

The product of its digits is 1792, while the sum is 26.

The square root of 721414421 is about 26859.1589778980. The cubic root of 721414421 is about 896.8674721671.

Adding to 721414421 its reverse (124414127), we get a palindrome (845828548).

The spelling of 721414421 in words is "seven hundred twenty-one million, four hundred fourteen thousand, four hundred twenty-one".