22021210121220 has 240 divisors, whose sum is σ = 70025621516928. Its totient is φ = 5792591301120.

The previous prime is 22021210121189. The next prime is 22021210121227. The reversal of 22021210121220 is 2212101212022.

It is a happy number.

22021210121220 is a `hidden beast` number, since 2 + 202 + 121 + 0 + 121 + 220 = 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 = 22021210121193 and 22021210121202.

It is not an unprimeable number, because it can be changed into a prime (22021210121227) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 35130064 + ... + 35751416.

Almost surely, 2^{22021210121220} is an apocalyptic number.

22021210121220 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 22021210121220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35012810758464).

22021210121220 is an abundant number, since it is smaller than the sum of its proper divisors (48004411395708).

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

22021210121220 is a wasteful number, since it uses less digits than its factorization.

22021210121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621672 (or 621661 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 22021210121220 its reverse (2212101212022), we get a palindrome (24233311333242).

The spelling of 22021210121220 in words is "twenty-two trillion, twenty-one billion, two hundred ten million, one hundred twenty-one thousand, two hundred twenty".