21754671217281 has 32 divisors (see below), whose sum is σ = 34133847770880. Its totient is φ = 13646440459008.

The previous prime is 21754671217271. The next prime is 21754671217319. The reversal of 21754671217281 is 18271217645712.

21754671217281 is a `hidden beast` number, since 2 + 1 + 7 + 5 + 467 + 1 + 2 + 172 + 8 + 1 = 666.

It is not a de Polignac number, because 21754671217281 - 2⁹ = 21754671216769 is a prime.

It is a super-2 number, since 2×21754671217281² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21754671217271) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4394326 + ... + 7925871.

It is an arithmetic number, because the mean of its divisors is an integer number (1066682742840).

Almost surely, 2^{21754671217281} is an apocalyptic number.

It is an amenable number.

21754671217281 is a deficient number, since it is larger than the sum of its proper divisors (12379176553599).

21754671217281 is a wasteful number, since it uses less digits than its factorization.

21754671217281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12324070 (or 12324064 counting only the distinct ones).

The product of its digits is 2634240, while the sum is 54.

The spelling of 21754671217281 in words is "twenty-one trillion, seven hundred fifty-four billion, six hundred seventy-one million, two hundred seventeen thousand, two hundred eighty-one".