21178333080 has 48 divisors (see below), whose sum is σ = 68829583680. Its totient is φ = 5647555392.

The previous prime is 21178333073. The next prime is 21178333087. The reversal of 21178333080 is 8033387112.

It is an interprime number because it is at equal distance from previous prime (21178333073) and next prime (21178333087).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21178333087) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29413992 + ... + 29414711.

It is an arithmetic number, because the mean of its divisors is an integer number (1433949660).

Almost surely, 2^21178333080 is an apocalyptic number.

21178333080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21178333080 is an abundant number, since it is smaller than the sum of its proper divisors (47651250600).

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

21178333080 is a wasteful number, since it uses less digits than its factorization.

21178333080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58828720 (or 58828713 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The spelling of 21178333080 in words is "twenty-one billion, one hundred seventy-eight million, three hundred thirty-three thousand, eighty".