21545541356 has 12 divisors (see below), whose sum is σ = 38322807600. Its totient is φ = 10596167760.

The previous prime is 21545541323. The next prime is 21545541377. The reversal of 21545541356 is 65314554512.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44150456 + ... + 44150943.

It is an arithmetic number, because the mean of its divisors is an integer number (3193567300).

Almost surely, 2^21545541356 is an apocalyptic number.

It is an amenable number.

21545541356 is a deficient number, since it is larger than the sum of its proper divisors (16777266244).

21545541356 is a wasteful number, since it uses less digits than its factorization.

21545541356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88301464 (or 88301462 counting only the distinct ones).

The product of its digits is 360000, while the sum is 41.

The spelling of 21545541356 in words is "twenty-one billion, five hundred forty-five million, five hundred forty-one thousand, three hundred fifty-six".