21654231543444 has 48 divisors (see below), whose sum is σ = 50657931192960. Its totient is φ = 7199308152960.

The previous prime is 21654231543443. The next prime is 21654231543463. The reversal of 21654231543444 is 44434513245612.

It is a super-2 number, since 2×21654231543444² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21654231543393 and 21654231543402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21654231543443) 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 15 ways as a sum of consecutive naturals, for example, 275666814 + ... + 275745354.

It is an arithmetic number, because the mean of its divisors is an integer number (1055373566520).

Almost surely, 2^{21654231543444} is an apocalyptic number.

It is an amenable number.

21654231543444 is an abundant number, since it is smaller than the sum of its proper divisors (29003699649516).

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

21654231543444 is a wasteful number, since it uses less digits than its factorization.

21654231543444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138000 (or 137998 counting only the distinct ones).

The product of its digits is 5529600, while the sum is 48.

The spelling of 21654231543444 in words is "twenty-one trillion, six hundred fifty-four billion, two hundred thirty-one million, five hundred forty-three thousand, four hundred forty-four".