21376003411721 has 8 divisors (see below), whose sum is σ = 24681570950400. Its totient is φ = 18133399064448.

The previous prime is 21376003411699. The next prime is 21376003411723. The reversal of 21376003411721 is 12711430067312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21376003411721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21376003411723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15740797121 + ... + 15740798478.

It is an arithmetic number, because the mean of its divisors is an integer number (3085196368800).

Almost surely, 2^{21376003411721} is an apocalyptic number.

It is an amenable number.

21376003411721 is a deficient number, since it is larger than the sum of its proper divisors (3305567538679).

21376003411721 is an equidigital number, since it uses as much as digits as its factorization.

21376003411721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31481595703.

The product of its (nonzero) digits is 42336, while the sum is 38.

The spelling of 21376003411721 in words is "twenty-one trillion, three hundred seventy-six billion, three million, four hundred eleven thousand, seven hundred twenty-one".