21908018924284 has 12 divisors (see below), whose sum is σ = 39062411101224. Its totient is φ = 10747330038224.

The previous prime is 21908018924279. The next prime is 21908018924287. The reversal of 21908018924284 is 48242981080912.

It is a super-2 number, since 2×21908018924284² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21908018924287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51669855742 + ... + 51669856165.

It is an arithmetic number, because the mean of its divisors is an integer number (3255200925102).

Almost surely, 2^{21908018924284} is an apocalyptic number.

It is an amenable number.

21908018924284 is a deficient number, since it is larger than the sum of its proper divisors (17154392176940).

21908018924284 is a wasteful number, since it uses less digits than its factorization.

21908018924284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103339711964 (or 103339711962 counting only the distinct ones).

The product of its (nonzero) digits is 5308416, while the sum is 58.

The spelling of 21908018924284 in words is "twenty-one trillion, nine hundred eight billion, eighteen million, nine hundred twenty-four thousand, two hundred eighty-four".