21854539148 has 24 divisors (see below), whose sum is σ = 41194139280. Its totient is φ = 10085060160.

The previous prime is 21854539139. The next prime is 21854539153. The reversal of 21854539148 is 84193545812.

It is a junction number, because it is equal to n+sod(n) for n = 21854539096 and 21854539105.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 321623 + ... + 383601.

It is an arithmetic number, because the mean of its divisors is an integer number (1716422470).

Almost surely, 2^21854539148 is an apocalyptic number.

It is an amenable number.

21854539148 is a deficient number, since it is larger than the sum of its proper divisors (19339600132).

21854539148 is a wasteful number, since it uses less digits than its factorization.

21854539148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68777 (or 68775 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 50.

The spelling of 21854539148 in words is "twenty-one billion, eight hundred fifty-four million, five hundred thirty-nine thousand, one hundred forty-eight".