21322021100220 has 72 divisors (see below), whose sum is σ = 64887471112464. Its totient is φ = 5667351522048.

The previous prime is 21322021100209. The next prime is 21322021100267. The reversal of 21322021100220 is 2200112022312.

21322021100220 is a `hidden beast` number, since 2 + 1 + 322 + 0 + 21 + 100 + 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 = 21322021100193 and 21322021100202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 192869289 + ... + 192979808.

It is an arithmetic number, because the mean of its divisors is an integer number (901214876562).

Almost surely, 2^{21322021100220} is an apocalyptic number.

21322021100220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21322021100220 is an abundant number, since it is smaller than the sum of its proper divisors (43565450012244).

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

21322021100220 is a wasteful number, since it uses less digits than its factorization.

21322021100220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385849419 (or 385849414 counting only the distinct ones).

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

Adding to 21322021100220 its reverse (2200112022312), we get a palindrome (23522133122532).

The spelling of 21322021100220 in words is "twenty-one trillion, three hundred twenty-two billion, twenty-one million, one hundred thousand, two hundred twenty".