21530544543254 has 16 divisors (see below), whose sum is σ = 32327967672000. Its totient is φ = 10754557140864.

The previous prime is 21530544543239. The next prime is 21530544543257. The reversal of 21530544543254 is 45234544503512.

It is a junction number, because it is equal to n+sod(n) for n = 21530544543199 and 21530544543208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21530544543257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23502734 + ... + 24401630.

It is an arithmetic number, because the mean of its divisors is an integer number (2020497979500).

Almost surely, 2^{21530544543254} is an apocalyptic number.

21530544543254 is a deficient number, since it is larger than the sum of its proper divisors (10797423128746).

21530544543254 is a wasteful number, since it uses less digits than its factorization.

21530544543254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910807.

The product of its (nonzero) digits is 5760000, while the sum is 47.

The spelling of 21530544543254 in words is "twenty-one trillion, five hundred thirty billion, five hundred forty-four million, five hundred forty-three thousand, two hundred fifty-four".