21670440550 has 144 divisors (see below), whose sum is σ = 45362565360. Its totient is φ = 7694438400.

The previous prime is 21670440527. The next prime is 21670440553. The reversal of 21670440550 is 5504407612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21670440553) 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 71 ways as a sum of consecutive naturals, for example, 61389174 + ... + 61389526.

It is an arithmetic number, because the mean of its divisors is an integer number (315017815).

Almost surely, 2^21670440550 is an apocalyptic number.

21670440550 is an abundant number, since it is smaller than the sum of its proper divisors (23692124810).

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

21670440550 is a wasteful number, since it uses less digits than its factorization.

21670440550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599 (or 583 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 34.

The spelling of 21670440550 in words is "twenty-one billion, six hundred seventy million, four hundred forty thousand, five hundred fifty".