21675237543 has 12 divisors (see below), whose sum is σ = 31821934248. Its totient is φ = 14213270160.

The previous prime is 21675237539. The next prime is 21675237583. The reversal of 21675237543 is 34573257612.

21675237543 is a `hidden beast` number, since 2 + 1 + 6 + 75 + 2 + 37 + 543 = 666.

It is not a de Polignac number, because 21675237543 - 2² = 21675237539 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21675237583) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19740105 + ... + 19741202.

It is an arithmetic number, because the mean of its divisors is an integer number (2651827854).

Almost surely, 2^21675237543 is an apocalyptic number.

21675237543 is a deficient number, since it is larger than the sum of its proper divisors (10146696705).

21675237543 is a wasteful number, since it uses less digits than its factorization.

21675237543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39481374 (or 39481371 counting only the distinct ones).

The product of its digits is 1058400, while the sum is 45.

The spelling of 21675237543 in words is "twenty-one billion, six hundred seventy-five million, two hundred thirty-seven thousand, five hundred forty-three".