20021212022220 has 72 divisors (see below), whose sum is σ = 60731458547760. Its totient is φ = 5338950422400.

The previous prime is 20021212022219. The next prime is 20021212022239. The reversal of 20021212022220 is 2222021212002.

20021212022220 is a `hidden beast` number, since 200 + 21 + 21 + 202 + 2 + 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 = 20021212022193 and 20021212022202.

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, 30427666 + ... + 31078694.

It is an arithmetic number, because the mean of its divisors is an integer number (843492479830).

Almost surely, 2^{20021212022220} is an apocalyptic number.

20021212022220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021212022220 is an abundant number, since it is smaller than the sum of its proper divisors (40710246525540).

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

20021212022220 is a wasteful number, since it uses less digits than its factorization.

20021212022220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821895 (or 821890 counting only the distinct ones).

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

Adding to 20021212022220 its reverse (2222021212002), we get a palindrome (22243233234222).

The spelling of 20021212022220 in words is "twenty trillion, twenty-one billion, two hundred twelve million, twenty-two thousand, two hundred twenty".