21374636322451 has 8 divisors (see below), whose sum is σ = 21381898017024. Its totient is φ = 21367375554120.

The previous prime is 21374636322427. The next prime is 21374636322467. The reversal of 21374636322451 is 15422363647312.

It is a happy number.

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-21374636322451 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21374636322395 and 21374636322404.

It is not an unprimeable number, because it can be changed into a prime (21374636325451) 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, 47596306 + ... + 48043288.

It is an arithmetic number, because the mean of its divisors is an integer number (2672737252128).

Almost surely, 2^{21374636322451} is an apocalyptic number.

21374636322451 is a deficient number, since it is larger than the sum of its proper divisors (7261694573).

21374636322451 is a wasteful number, since it uses less digits than its factorization.

21374636322451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463121.

The product of its digits is 4354560, while the sum is 49.

Adding to 21374636322451 its reverse (15422363647312), we get a palindrome (36796999969763).

The spelling of 21374636322451 in words is "twenty-one trillion, three hundred seventy-four billion, six hundred thirty-six million, three hundred twenty-two thousand, four hundred fifty-one".