721421449 has 32 divisors (see below), whose sum is σ = 873399296. Its totient is φ = 582966720.

The previous prime is 721421447. The next prime is 721421461. The reversal of 721421449 is 944124127.

It is a happy number.

It is not a de Polignac number, because 721421449 - 2¹ = 721421447 is a prime.

It is not an unprimeable number, because it can be changed into a prime (721421447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2349754 + ... + 2350060.

It is an arithmetic number, because the mean of its divisors is an integer number (27293728).

Almost surely, 2^721421449 is an apocalyptic number.

It is an amenable number.

721421449 is a deficient number, since it is larger than the sum of its proper divisors (151977847).

721421449 is a wasteful number, since it uses less digits than its factorization.

721421449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605.

The product of its digits is 16128, while the sum is 34.

The square root of 721421449 is about 26859.2898081837. The cubic root of 721421449 is about 896.8703845773.

The spelling of 721421449 in words is "seven hundred twenty-one million, four hundred twenty-one thousand, four hundred forty-nine".