21222002012220 has 72 divisors (see below), whose sum is σ = 64455202475664. Its totient is φ = 5652009646848.

The previous prime is 21222002012219. The next prime is 21222002012221. The reversal of 21222002012220 is 2221020022212.

21222002012220 is a `hidden beast` number, since 21 + 2 + 220 + 0 + 201 + 2 + 220 = 666.

It is an interprime number because it is at equal distance from previous prime (21222002012219) and next prime (21222002012221).

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 = 21222002012193 and 21222002012202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222002012221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74763049 + ... + 75046368.

Almost surely, 2^{21222002012220} is an apocalyptic number.

21222002012220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222002012220 is an abundant number, since it is smaller than the sum of its proper divisors (43233200463444).

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

21222002012220 is a wasteful number, since it uses less digits than its factorization.

21222002012220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149810219 (or 149810214 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21222002012220 its reverse (2221020022212), we get a palindrome (23443022034432).

The spelling of 21222002012220 in words is "twenty-one trillion, two hundred twenty-two billion, two million, twelve thousand, two hundred twenty".