201122231220 has 72 divisors (see below), whose sum is σ = 616111128360. Its totient is φ = 53101574400.

The previous prime is 201122231137. The next prime is 201122231273. The reversal of 201122231220 is 22132221102.

201122231220 is a `hidden beast` number, since 201 + 12 + 2 + 231 + 220 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 29895101604 + 171227129616 = 172902^2 + 413796^2 .

It is a super-2 number, since 2×201122231220² (a number of 23 digits) contains 22 as substring.

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 = 201122231193 and 201122231202.

It is a congruent number.

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, 5513235 + ... + 5549594.

It is an arithmetic number, because the mean of its divisors is an integer number (8557099005).

Almost surely, 2^201122231220 is an apocalyptic number.

201122231220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201122231220 is an abundant number, since it is smaller than the sum of its proper divisors (414988897140).

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

201122231220 is a wasteful number, since it uses less digits than its factorization.

201122231220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11062945 (or 11062940 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 201122231220 its reverse (22132221102), we get a palindrome (223254452322).

The spelling of 201122231220 in words is "two hundred one billion, one hundred twenty-two million, two hundred thirty-one thousand, two hundred twenty".