21654013443 has 16 divisors (see below), whose sum is σ = 29368296960. Its totient is φ = 14187985056.

The previous prime is 21654013427. The next prime is 21654013489. The reversal of 21654013443 is 34431045612.

It is a happy number.

It is not a de Polignac number, because 21654013443 - 2⁴ = 21654013427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21654013243) 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 in 15 ways as a sum of consecutive naturals, for example, 902721 + ... + 926397.

It is an arithmetic number, because the mean of its divisors is an integer number (1835518560).

Almost surely, 2^21654013443 is an apocalyptic number.

21654013443 is a deficient number, since it is larger than the sum of its proper divisors (7714283517).

21654013443 is a wasteful number, since it uses less digits than its factorization.

21654013443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28906.

The product of its (nonzero) digits is 34560, while the sum is 33.

The spelling of 21654013443 in words is "twenty-one billion, six hundred fifty-four million, thirteen thousand, four hundred forty-three".