21321300302100 has 54 divisors (see below), whose sum is σ = 66830431283070. Its totient is φ = 5685680080320.

The previous prime is 21321300302087. The next prime is 21321300302101. The reversal of 21321300302100 is 120300312312.

21321300302100 is a `hidden beast` number, since 2 + 1 + 321 + 30 + 0 + 302 + 10 + 0 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 336673815696 + 20984626486404 = 580236^2 + 4580898^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321300302101) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 11845165935 + ... + 11845167734.

Almost surely, 2^{21321300302100} is an apocalyptic number.

21321300302100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21321300302100 is an abundant number, since it is smaller than the sum of its proper divisors (45509130980970).

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

21321300302100 is a wasteful number, since it uses less digits than its factorization.

21321300302100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23690333689 (or 23690333679 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21321300302100 its reverse (120300312312), we get a palindrome (21441600614412).

The spelling of 21321300302100 in words is "twenty-one trillion, three hundred twenty-one billion, three hundred million, three hundred two thousand, one hundred".