21385677243345 has 8 divisors (see below), whose sum is σ = 34217083589376. Its totient is φ = 11405694529776.

The previous prime is 21385677243283. The next prime is 21385677243349. The reversal of 21385677243345 is 54334277658312.

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

It is not a de Polignac number, because 21385677243345 - 2⁸ = 21385677243089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21385677243349) 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, 712855908097 + ... + 712855908126.

It is an arithmetic number, because the mean of its divisors is an integer number (4277135448672).

Almost surely, 2^{21385677243345} is an apocalyptic number.

It is an amenable number.

21385677243345 is a deficient number, since it is larger than the sum of its proper divisors (12831406346031).

21385677243345 is a wasteful number, since it uses less digits than its factorization.

21385677243345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1425711816231.

The product of its digits is 101606400, while the sum is 60.

The spelling of 21385677243345 in words is "twenty-one trillion, three hundred eighty-five billion, six hundred seventy-seven million, two hundred forty-three thousand, three hundred forty-five".