20021101220 has 12 divisors (see below), whose sum is σ = 42044312604. Its totient is φ = 8008440480.

The previous prime is 20021101207. The next prime is 20021101237. The reversal of 20021101220 is 2210112002.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3072706624 + 16948394596 = 55432^2 + 130186^2 .

It is a super-2 number, since 2×20021101220² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 500527511 + ... + 500527550.

It is an arithmetic number, because the mean of its divisors is an integer number (3503692717).

Almost surely, 2^20021101220 is an apocalyptic number.

20021101220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021101220 is an abundant number, since it is smaller than the sum of its proper divisors (22023211384).

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

20021101220 is a wasteful number, since it uses less digits than its factorization.

20021101220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001055070 (or 1001055068 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20021101220 its reverse (2210112002), we get a palindrome (22231213222).

The spelling of 20021101220 in words is "twenty billion, twenty-one million, one hundred one thousand, two hundred twenty".