21783484924 has 12 divisors (see below), whose sum is σ = 38127643848. Its totient is φ = 10889872400.

The previous prime is 21783484913. The next prime is 21783484927. The reversal of 21783484924 is 42948438712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21783484927) 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, 441142 + ... + 488029.

It is an arithmetic number, because the mean of its divisors is an integer number (3177303654).

Almost surely, 2^21783484924 is an apocalyptic number.

It is an amenable number.

21783484924 is a deficient number, since it is larger than the sum of its proper divisors (16344158924).

21783484924 is a wasteful number, since it uses less digits than its factorization.

21783484924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935036 (or 935034 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 52.

The spelling of 21783484924 in words is "twenty-one billion, seven hundred eighty-three million, four hundred eighty-four thousand, nine hundred twenty-four".