21675237542 has 16 divisors (see below), whose sum is σ = 37192929792. Its totient is φ = 9280542600.

The previous prime is 21675237539. The next prime is 21675237583. The reversal of 21675237542 is 24573257612.

It is a junction number, because it is equal to n+sod(n) for n = 21675237493 and 21675237502.

It is a congruent number.

It is an unprimeable number.

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, 721838 + ... + 751265.

It is an arithmetic number, because the mean of its divisors is an integer number (2324558112).

Almost surely, 2^21675237542 is an apocalyptic number.

21675237542 is a deficient number, since it is larger than the sum of its proper divisors (15517692250).

21675237542 is a wasteful number, since it uses less digits than its factorization.

21675237542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1474163.

The product of its digits is 705600, while the sum is 44.

The spelling of 21675237542 in words is "twenty-one billion, six hundred seventy-five million, two hundred thirty-seven thousand, five hundred forty-two".