201231002122220 has 96 divisors (see below), whose sum is σ = 499749612969600. Its totient is φ = 66595519678464.

The previous prime is 201231002122217. The next prime is 201231002122237. The reversal of 201231002122220 is 22221200132102.

It is a super-2 number, since 2×201231002122220² (a number of 29 digits) contains 22 as substring.

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 = 201231002122192 and 201231002122201.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7305314 + ... + 21350166.

It is an arithmetic number, because the mean of its divisors is an integer number (5205725135100).

Almost surely, 2^{201231002122220} is an apocalyptic number.

201231002122220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201231002122220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (249874806484800).

201231002122220 is an abundant number, since it is smaller than the sum of its proper divisors (298518610847380).

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

201231002122220 is a wasteful number, since it uses less digits than its factorization.

201231002122220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14048427 (or 14048425 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 201231002122220 its reverse (22221200132102), we get a palindrome (223452202254322).

The spelling of 201231002122220 in words is "two hundred one trillion, two hundred thirty-one billion, two million, one hundred twenty-two thousand, two hundred twenty".