201212211222020 has 48 divisors (see below), whose sum is σ = 426304259766000. Its totient is φ = 79771301061120.

The previous prime is 201212211221999. The next prime is 201212211222047. The reversal of 201212211222020 is 20222112212102.

It can be written as a sum of positive squares in 8 ways, for example, as 34216346076676 + 166995865145344 = 5849474^2 + 12922688^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 201212211221983 and 201212211222001.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71859275 + ... + 74606834.

It is an arithmetic number, because the mean of its divisors is an integer number (8881338745125).

Almost surely, 2^{201212211222020} is an apocalyptic number.

201212211222020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201212211222020 is an abundant number, since it is smaller than the sum of its proper divisors (225092048543980).

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

201212211222020 is a wasteful number, since it uses less digits than its factorization.

201212211222020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146466728 (or 146466726 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 201212211222020 its reverse (20222112212102), we get a palindrome (221434323434122).

The spelling of 201212211222020 in words is "two hundred one trillion, two hundred twelve billion, two hundred eleven million, two hundred twenty-two thousand, twenty".