20210101220 has 12 divisors (see below), whose sum is σ = 42441212604. Its totient is φ = 8084040480.

The previous prime is 20210101217. The next prime is 20210101229. The reversal of 20210101220 is 2210101202.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9807733156 + 10402368064 = 99034^2 + 101992^2 .

It is not an unprimeable number, because it can be changed into a prime (20210101229) 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 3 ways as a sum of consecutive naturals, for example, 505252511 + ... + 505252550.

It is an arithmetic number, because the mean of its divisors is an integer number (3536767717).

Almost surely, 2^20210101220 is an apocalyptic number.

20210101220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20210101220 is an abundant number, since it is smaller than the sum of its proper divisors (22231111384).

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

20210101220 is a wasteful number, since it uses less digits than its factorization.

20210101220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010505070 (or 1010505068 counting only the distinct ones).

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

Adding to 20210101220 its reverse (2210101202), we get a palindrome (22420202422).

The spelling of 20210101220 in words is "twenty billion, two hundred ten million, one hundred one thousand, two hundred twenty".