21221211033330 has 256 divisors, whose sum is σ = 64234093658112. Its totient is φ = 4358649600000.

The previous prime is 21221211033311. The next prime is 21221211033331. The reversal of 21221211033330 is 3333011212212.

It is a super-2 number, since 2×21221211033330² (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 21221211033330.

It is not an unprimeable number, because it can be changed into a prime (21221211033331) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 140143639 + ... + 140294981.

It is an arithmetic number, because the mean of its divisors is an integer number (250914428352).

Almost surely, 2^{21221211033330} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21221211033330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32117046829056).

21221211033330 is an abundant number, since it is smaller than the sum of its proper divisors (43012882624782).

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

21221211033330 is a wasteful number, since it uses less digits than its factorization.

21221211033330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152073.

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

Adding to 21221211033330 its reverse (3333011212212), we get a palindrome (24554222245542).

The spelling of 21221211033330 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred eleven million, thirty-three thousand, three hundred thirty".