721421487 has 24 divisors (see below), whose sum is σ = 1088699040. Its totient is φ = 459748800.

The previous prime is 721421461. The next prime is 721421521. The reversal of 721421487 is 784124127.

It is not a de Polignac number, because 721421487 - 2⁶ = 721421423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721421417) 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 23 ways as a sum of consecutive naturals, for example, 12678 + ... + 40044.

It is an arithmetic number, because the mean of its divisors is an integer number (45362460).

Almost surely, 2^721421487 is an apocalyptic number.

721421487 is a deficient number, since it is larger than the sum of its proper divisors (367277553).

721421487 is a wasteful number, since it uses less digits than its factorization.

721421487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27503 (or 27500 counting only the distinct ones).

The product of its digits is 25088, while the sum is 36.

The square root of 721421487 is about 26859.2905155739. The cubic root of 721421487 is about 896.8704003244.

It can be divided in two parts, 7214214 and 87, that added together give a triangular number (7214301 = T₃₇₉₈).

The spelling of 721421487 in words is "seven hundred twenty-one million, four hundred twenty-one thousand, four hundred eighty-seven".