21327018680 has 64 divisors (see below), whose sum is σ = 52430496480. Its totient is φ = 7743078400.

The previous prime is 21327018679. The next prime is 21327018689. The reversal of 21327018680 is 8681072312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21327018689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 244232 + ... + 319848.

Almost surely, 2^21327018680 is an apocalyptic number.

21327018680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21327018680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26215248240).

21327018680 is an abundant number, since it is smaller than the sum of its proper divisors (31103477800).

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

21327018680 is a wasteful number, since it uses less digits than its factorization.

21327018680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76280 (or 76276 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 38.

The spelling of 21327018680 in words is "twenty-one billion, three hundred twenty-seven million, eighteen thousand, six hundred eighty".