21476642334721 has 8 divisors (see below), whose sum is σ = 24590103295424. Its totient is φ = 18374523673680.

The previous prime is 21476642334703. The next prime is 21476642334743. The reversal of 21476642334721 is 12743324667412.

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 21476642334721 - 2¹⁵ = 21476642301953 is a prime.

It is a super-2 number, since 2×21476642334721² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21476642334701) 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, 2835570855 + ... + 2835578428.

It is an arithmetic number, because the mean of its divisors is an integer number (3073762911928).

Almost surely, 2^{21476642334721} is an apocalyptic number.

It is an amenable number.

21476642334721 is a deficient number, since it is larger than the sum of its proper divisors (3113460960703).

21476642334721 is an equidigital number, since it uses as much as digits as its factorization.

21476642334721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5671149831.

The product of its digits is 8128512, while the sum is 52.

The spelling of 21476642334721 in words is "twenty-one trillion, four hundred seventy-six billion, six hundred forty-two million, three hundred thirty-four thousand, seven hundred twenty-one".