21020022211220 has 144 divisors (see below), whose sum is σ = 46025006630400. Its totient is φ = 8063300344320.

The previous prime is 21020022211183. The next prime is 21020022211229. The reversal of 21020022211220 is 2211222002012.

It is a happy number.

21020022211220 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020022211229) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1577244197 + ... + 1577257523.

It is an arithmetic number, because the mean of its divisors is an integer number (319618101600).

Almost surely, 2^{21020022211220} is an apocalyptic number.

21020022211220 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 21020022211220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23012503315200).

21020022211220 is an abundant number, since it is smaller than the sum of its proper divisors (25004984419180).

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

21020022211220 is a wasteful number, since it uses less digits than its factorization.

21020022211220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14134 (or 14101 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21020022211220 its reverse (2211222002012), we get a palindrome (23231244213232).

The spelling of 21020022211220 in words is "twenty-one trillion, twenty billion, twenty-two million, two hundred eleven thousand, two hundred twenty".