21541463056 has 10 divisors (see below), whose sum is σ = 41736584702. Its totient is φ = 10770731520.

The previous prime is 21541463029. The next prime is 21541463057. The reversal of 21541463056 is 65036414512.

It can be written as a sum of positive squares in only one way, i.e., 20597990400 + 943472656 = 143520^2 + 30716^2 .

It is not an unprimeable number, because it can be changed into a prime (21541463057) by changing a digit.

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 as a sum of consecutive naturals, namely, 673170705 + ... + 673170736.

Almost surely, 2^21541463056 is an apocalyptic number.

It is an amenable number.

21541463056 is a deficient number, since it is larger than the sum of its proper divisors (20195121646).

21541463056 is a wasteful number, since it uses less digits than its factorization.

21541463056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1346341449 (or 1346341443 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

Adding to 21541463056 its reverse (65036414512), we get a palindrome (86577877568).

The spelling of 21541463056 in words is "twenty-one billion, five hundred forty-one million, four hundred sixty-three thousand, fifty-six".