21374257456667 has 8 divisors (see below), whose sum is σ = 21743118037680. Its totient is φ = 21005616376800.

The previous prime is 21374257456637. The next prime is 21374257456679. The reversal of 21374257456667 is 76665475247312.

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 21374257456667 - 2⁸ = 21374257456411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21374257456637) 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, 54678848 + ... + 55068365.

It is an arithmetic number, because the mean of its divisors is an integer number (2717889754710).

Almost surely, 2^{21374257456667} is an apocalyptic number.

21374257456667 is a deficient number, since it is larger than the sum of its proper divisors (368860581013).

21374257456667 is a wasteful number, since it uses less digits than its factorization.

21374257456667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109750573.

The product of its digits is 355622400, while the sum is 65.

The spelling of 21374257456667 in words is "twenty-one trillion, three hundred seventy-four billion, two hundred fifty-seven million, four hundred fifty-six thousand, six hundred sixty-seven".