21310327800 has 384 divisors, whose sum is σ = 77688480000. Its totient is φ = 5354242560.

The previous prime is 21310327789. The next prime is 21310327889. The reversal of 21310327800 is 872301312.

21310327800 is a `hidden beast` number, since 21 + 310 + 327 + 8 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 23494947 + ... + 23495853.

It is an arithmetic number, because the mean of its divisors is an integer number (202313750).

Almost surely, 2^21310327800 is an apocalyptic number.

21310327800 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 21310327800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38844240000).

21310327800 is an abundant number, since it is smaller than the sum of its proper divisors (56378152200).

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

21310327800 is a wasteful number, since it uses less digits than its factorization.

21310327800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1180 (or 1165 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The spelling of 21310327800 in words is "twenty-one billion, three hundred ten million, three hundred twenty-seven thousand, eight hundred".