21156241712 has 40 divisors (see below), whose sum is σ = 42212774400. Its totient is φ = 10267163712.

The previous prime is 21156241699. The next prime is 21156241723. The reversal of 21156241712 is 21714265112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67268 + ... + 216419.

It is an arithmetic number, because the mean of its divisors is an integer number (1055319360).

Almost surely, 2^21156241712 is an apocalyptic number.

It is an amenable number.

21156241712 is a deficient number, since it is larger than the sum of its proper divisors (21056532688).

21156241712 is a wasteful number, since it uses less digits than its factorization.

21156241712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283833 (or 283827 counting only the distinct ones).

The product of its digits is 6720, while the sum is 32.

The spelling of 21156241712 in words is "twenty-one billion, one hundred fifty-six million, two hundred forty-one thousand, seven hundred twelve".