21031466700 has 288 divisors, whose sum is σ = 68395622400. Its totient is φ = 4958392320.

The previous prime is 21031466669. The next prime is 21031466707. The reversal of 21031466700 is 766413012.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (21031466707) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 12305446 + ... + 12307154.

It is an arithmetic number, because the mean of its divisors is an integer number (237484800).

Almost surely, 2^21031466700 is an apocalyptic number.

21031466700 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 21031466700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34197811200).

21031466700 is an abundant number, since it is smaller than the sum of its proper divisors (47364155700).

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

21031466700 is a wasteful number, since it uses less digits than its factorization.

21031466700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1889 (or 1882 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

Adding to 21031466700 its reverse (766413012), we get a palindrome (21797879712).

The spelling of 21031466700 in words is "twenty-one billion, thirty-one million, four hundred sixty-six thousand, seven hundred".