21030285312 has 182 divisors, whose sum is σ = 63063262572. Its totient is φ = 7009099776.

The previous prime is 21030285301. The next prime is 21030285323. The reversal of 21030285312 is 21358203012.

21030285312 is a `hidden beast` number, since 2 + 103 + 0 + 28 + 531 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (21030285301) and next prime (21030285323).

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

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 2982463 + ... + 2989505.

Almost surely, 2^21030285312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21030285312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31531631286).

21030285312 is an abundant number, since it is smaller than the sum of its proper divisors (42032977260).

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

21030285312 is an frugal number, since it uses more digits than its factorization.

21030285312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7085 (or 7048 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

Adding to 21030285312 its reverse (21358203012), we get a palindrome (42388488324).

The spelling of 21030285312 in words is "twenty-one billion, thirty million, two hundred eighty-five thousand, three hundred twelve".