21354665156673 has 8 divisors (see below), whose sum is σ = 28472908437600. Its totient is φ = 14236432656768.

The previous prime is 21354665156581. The next prime is 21354665156681. The reversal of 21354665156673 is 37665156645312.

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

It is not a de Polignac number, because 21354665156673 - 2²⁴ = 21354648379457 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21354665146673) 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, 5399998 + ... + 8477576.

It is an arithmetic number, because the mean of its divisors is an integer number (3559113554700).

Almost surely, 2^{21354665156673} is an apocalyptic number.

It is an amenable number.

21354665156673 is a deficient number, since it is larger than the sum of its proper divisors (7118243280927).

21354665156673 is a wasteful number, since it uses less digits than its factorization.

21354665156673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5390511.

The product of its digits is 81648000, while the sum is 60.

The spelling of 21354665156673 in words is "twenty-one trillion, three hundred fifty-four billion, six hundred sixty-five million, one hundred fifty-six thousand, six hundred seventy-three".