5657213721 has 8 divisors (see below), whose sum is σ = 7544912704. Its totient is φ = 3770495280.

The previous prime is 5657213713. The next prime is 5657213741. The reversal of 5657213721 is 1273127565.

It is a happy number.

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

It is not a de Polignac number, because 5657213721 - 2³ = 5657213713 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 5657213721.

It is not an unprimeable number, because it can be changed into a prime (5657213741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231565 + ... + 254826.

It is an arithmetic number, because the mean of its divisors is an integer number (943114088).

Almost surely, 2^5657213721 is an apocalyptic number.

It is an amenable number.

5657213721 is a deficient number, since it is larger than the sum of its proper divisors (1887698983).

5657213721 is a wasteful number, since it uses less digits than its factorization.

5657213721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490271.

The product of its digits is 88200, while the sum is 39.

The square root of 5657213721 is about 75214.4515435697. The cubic root of 5657213721 is about 1781.8351776245.

The spelling of 5657213721 in words is "five billion, six hundred fifty-seven million, two hundred thirteen thousand, seven hundred twenty-one".