21021212020230 has 288 divisors, whose sum is σ = 58026424135680. Its totient is φ = 5278904991360.

The previous prime is 21021212020201. The next prime is 21021212020271. The reversal of 21021212020230 is 3202021212012.

21021212020230 is a `hidden beast` number, since 21 + 0 + 212 + 1 + 202 + 0 + 230 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 792074301 + ... + 792100839.

It is an arithmetic number, because the mean of its divisors is an integer number (201480639360).

Almost surely, 2^{21021212020230} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21021212020230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29013212067840).

21021212020230 is an abundant number, since it is smaller than the sum of its proper divisors (37005212115450).

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

21021212020230 is a wasteful number, since it uses less digits than its factorization.

21021212020230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26856 (or 26830 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21021212020230 its reverse (3202021212012), we get a palindrome (24223233232242).

The spelling of 21021212020230 in words is "twenty-one trillion, twenty-one billion, two hundred twelve million, twenty thousand, two hundred thirty".