21783484902 has 16 divisors (see below), whose sum is σ = 43608913920. Its totient is φ = 7254170952.

The previous prime is 21783484889. The next prime is 21783484903. The reversal of 21783484902 is 20948438712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21783484903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1740918 + ... + 1753385.

It is an arithmetic number, because the mean of its divisors is an integer number (2725557120).

Almost surely, 2^21783484902 is an apocalyptic number.

21783484902 is an abundant number, since it is smaller than the sum of its proper divisors (21825429018).

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

21783484902 is a wasteful number, since it uses less digits than its factorization.

21783484902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3495347.

The product of its (nonzero) digits is 774144, while the sum is 48.

The spelling of 21783484902 in words is "twenty-one billion, seven hundred eighty-three million, four hundred eighty-four thousand, nine hundred two".