721014013 has 4 divisors (see below), whose sum is σ = 763426620. Its totient is φ = 678601408.

The previous prime is 721014011. The next prime is 721014031. The reversal of 721014013 is 310410127.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 311275449 + 409738564 = 17643^2 + 20242^2 .

It is a cyclic number.

It is not a de Polignac number, because 721014013 - 2¹ = 721014011 is a prime.

It is a super-2 number, since 2×721014013² = 1039722413884728338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721014011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21206278 + ... + 21206311.

It is an arithmetic number, because the mean of its divisors is an integer number (190856655).

Almost surely, 2^721014013 is an apocalyptic number.

It is an amenable number.

721014013 is a deficient number, since it is larger than the sum of its proper divisors (42412607).

721014013 is a wasteful number, since it uses less digits than its factorization.

721014013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42412606.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 721014013 is about 26851.7040986229. The cubic root of 721014013 is about 896.7015114467.

The spelling of 721014013 in words is "seven hundred twenty-one million, fourteen thousand, thirteen".