21212111001330 has 256 divisors, whose sum is σ = 59416987069440. Its totient is φ = 5374803050496.

The previous prime is 21212111001317. The next prime is 21212111001359. The reversal of 21212111001330 is 3310011121212.

21212111001330 is a `hidden beast` number, since 2 + 1 + 21 + 211 + 100 + 1 + 330 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 626503762 + ... + 626537618.

It is an arithmetic number, because the mean of its divisors is an integer number (232097605740).

Almost surely, 2^{21212111001330} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21212111001330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29708493534720).

21212111001330 is an abundant number, since it is smaller than the sum of its proper divisors (38204876068110).

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

21212111001330 is a wasteful number, since it uses less digits than its factorization.

21212111001330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34562 (or 34556 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 21212111001330 its reverse (3310011121212), we get a palindrome (24522122122542).

The spelling of 21212111001330 in words is "twenty-one trillion, two hundred twelve billion, one hundred eleven million, one thousand, three hundred thirty".