21220121223132 has 192 divisors, whose sum is σ = 56351240601600. Its totient is φ = 6161150304000.

The previous prime is 21220121223109. The next prime is 21220121223179. The reversal of 21220121223132 is 23132212102212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 912642507 + ... + 912665757.

It is an arithmetic number, because the mean of its divisors is an integer number (293496044800).

Almost surely, 2^{21220121223132} 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 21220121223132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28175620300800).

21220121223132 is an abundant number, since it is smaller than the sum of its proper divisors (35131119378468).

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

21220121223132 is a wasteful number, since it uses less digits than its factorization.

21220121223132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24496 (or 24494 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 21220121223132 its reverse (23132212102212), we get a palindrome (44352333325344).

The spelling of 21220121223132 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty-one million, two hundred twenty-three thousand, one hundred thirty-two".