721714621 has 8 divisors (see below), whose sum is σ = 735920640. Its totient is φ = 707530512.

The previous prime is 721714613. The next prime is 721714649. The reversal of 721714621 is 126417127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 721714621 - 2³ = 721714613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721714661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71536 + ... + 80998.

It is an arithmetic number, because the mean of its divisors is an integer number (91990080).

Almost surely, 2^721714621 is an apocalyptic number.

It is an amenable number.

721714621 is a deficient number, since it is larger than the sum of its proper divisors (14206019).

721714621 is a wasteful number, since it uses less digits than its factorization.

721714621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10955.

The product of its digits is 4704, while the sum is 31.

The square root of 721714621 is about 26864.7468069215. The cubic root of 721714621 is about 896.9918584976.

The spelling of 721714621 in words is "seven hundred twenty-one million, seven hundred fourteen thousand, six hundred twenty-one".