21132020021220 has 288 divisors, whose sum is σ = 65636007091200. Its totient is φ = 5500862115840.

The previous prime is 21132020021191. The next prime is 21132020021221. The reversal of 21132020021220 is 2212002023112.

21132020021220 is a `hidden beast` number, since 21 + 1 + 320 + 200 + 2 + 122 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21132020021193 and 21132020021202.

It is not an unprimeable number, because it can be changed into a prime (21132020021221) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 8290316506 + ... + 8290319054.

It is an arithmetic number, because the mean of its divisors is an integer number (227902802400).

Almost surely, 2^{21132020021220} is an apocalyptic number.

21132020021220 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 21132020021220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32818003545600).

21132020021220 is an abundant number, since it is smaller than the sum of its proper divisors (44503987069980).

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

21132020021220 is a wasteful number, since it uses less digits than its factorization.

21132020021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4795 (or 4790 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21132020021220 its reverse (2212002023112), we get a palindrome (23344022044332).

The spelling of 21132020021220 in words is "twenty-one trillion, one hundred thirty-two billion, twenty million, twenty-one thousand, two hundred twenty".