21545234224542 has 40 divisors (see below), whose sum is σ = 55174038969456. Its totient is φ = 6155781206688.

The previous prime is 21545234224531. The next prime is 21545234224669. The reversal of 21545234224542 is 24542243254512.

21545234224542 is a `hidden beast` number, since 2 + 1 + 5 + 4 + 52 + 34 + 2 + 24 + 542 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9499661223 + ... + 9499663490.

Almost surely, 2^{21545234224542} is an apocalyptic number.

21545234224542 is an abundant number, since it is smaller than the sum of its proper divisors (33628804744914).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21545234224542 is a wasteful number, since it uses less digits than its factorization.

21545234224542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18999324734 (or 18999324725 counting only the distinct ones).

The product of its digits is 3072000, while the sum is 45.

The spelling of 21545234224542 in words is "twenty-one trillion, five hundred forty-five billion, two hundred thirty-four million, two hundred twenty-four thousand, five hundred forty-two".