21982610440 has 32 divisors (see below), whose sum is σ = 56526713280. Its totient is φ = 7536894912.

The previous prime is 21982610423. The next prime is 21982610449. The reversal of 21982610440 is 4401628912.

It is a self number, because there is not a number n which added to its sum of digits gives 21982610440.

It is not an unprimeable number, because it can be changed into a prime (21982610449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39254382 + ... + 39254941.

It is an arithmetic number, because the mean of its divisors is an integer number (1766459790).

Almost surely, 2^21982610440 is an apocalyptic number.

21982610440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21982610440 is an abundant number, since it is smaller than the sum of its proper divisors (34544102840).

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

21982610440 is a wasteful number, since it uses less digits than its factorization.

21982610440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78509341 (or 78509337 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The spelling of 21982610440 in words is "twenty-one billion, nine hundred eighty-two million, six hundred ten thousand, four hundred forty".