21121003221332 has 216 divisors, whose sum is σ = 49199630485824. Its totient is φ = 7867964138496.

The previous prime is 21121003221317. The next prime is 21121003221359. The reversal of 21121003221332 is 23312230012112.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a junction number, because it is equal to n+sod(n) for n = 21121003221298 and 21121003221307.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 64287023 + ... + 64614729.

It is an arithmetic number, because the mean of its divisors is an integer number (227776067064).

Almost surely, 2^{21121003221332} 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 21121003221332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24599815242912).

21121003221332 is an abundant number, since it is smaller than the sum of its proper divisors (28078627264492).

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

21121003221332 is a wasteful number, since it uses less digits than its factorization.

21121003221332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327823 (or 327785 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21121003221332 its reverse (23312230012112), we get a palindrome (44433233233444).

The spelling of 21121003221332 in words is "twenty-one trillion, one hundred twenty-one billion, three million, two hundred twenty-one thousand, three hundred thirty-two".