21022101220120 has 576 divisors, whose sum is σ = 65653965720000. Its totient is φ = 6048236113920.

The previous prime is 21022101220103. The next prime is 21022101220177. The reversal of 21022101220120 is 2102210122012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21022101220094 and 21022101220103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 280522816 + ... + 280597744.

It is an arithmetic number, because the mean of its divisors is an integer number (113982579375).

Almost surely, 2^{21022101220120} is an apocalyptic number.

21022101220120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21022101220120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32826982860000).

21022101220120 is an abundant number, since it is smaller than the sum of its proper divisors (44631864499880).

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

21022101220120 is a wasteful number, since it uses less digits than its factorization.

21022101220120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75009 (or 74967 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21022101220120 its reverse (2102210122012), we get a palindrome (23124311342132).

The spelling of 21022101220120 in words is "twenty-one trillion, twenty-two billion, one hundred one million, two hundred twenty thousand, one hundred twenty".