21541415884 has 12 divisors (see below), whose sum is σ = 37700070408. Its totient is φ = 10769967200.

The previous prime is 21541415881. The next prime is 21541415899. The reversal of 21541415884 is 48851414512.

It is a self number, because there is not a number n which added to its sum of digits gives 21541415884.

It is not an unprimeable number, because it can be changed into a prime (21541415881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116962 + ... + 238249.

It is an arithmetic number, because the mean of its divisors is an integer number (3141672534).

Almost surely, 2^21541415884 is an apocalyptic number.

It is an amenable number.

21541415884 is a deficient number, since it is larger than the sum of its proper divisors (16158654524).

21541415884 is a wasteful number, since it uses less digits than its factorization.

21541415884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370376 (or 370374 counting only the distinct ones).

The product of its digits is 204800, while the sum is 43.

The spelling of 21541415884 in words is "twenty-one billion, five hundred forty-one million, four hundred fifteen thousand, eight hundred eighty-four".