21121202133330 has 128 divisors (see below), whose sum is σ = 55159632654336. Its totient is φ = 5144844902400.

The previous prime is 21121202133287. The next prime is 21121202133331. The reversal of 21121202133330 is 3333120212112.

It is a super-2 number, since 2×21121202133330² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21121202133330.

It is not an unprimeable number, because it can be changed into a prime (21121202133331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 365446735 + ... + 365504525.

It is an arithmetic number, because the mean of its divisors is an integer number (430934630112).

Almost surely, 2^{21121202133330} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21121202133330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27579816327168).

21121202133330 is an abundant number, since it is smaller than the sum of its proper divisors (34038430521006).

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

21121202133330 is a wasteful number, since it uses less digits than its factorization.

21121202133330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67572.

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 21121202133330 its reverse (3333120212112), we get a palindrome (24454322345442).

The spelling of 21121202133330 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred two million, one hundred thirty-three thousand, three hundred thirty".