201220101144 has 192 divisors, whose sum is σ = 568808079840. Its totient is φ = 64205291520.

The previous prime is 201220101083. The next prime is 201220101209. The reversal of 201220101144 is 441101022102.

201220101144 is a `hidden beast` number, since 201 + 220 + 101 + 144 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 56824014 + ... + 56827554.

Almost surely, 2^201220101144 is an apocalyptic number.

201220101144 is a gapful number since it is divisible by the number (24) 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 201220101144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (284404039920).

201220101144 is an abundant number, since it is smaller than the sum of its proper divisors (367587978696).

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

201220101144 is a wasteful number, since it uses less digits than its factorization.

201220101144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3930 (or 3923 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 201220101144 its reverse (441101022102), we get a palindrome (642321123246).

The spelling of 201220101144 in words is "two hundred one billion, two hundred twenty million, one hundred one thousand, one hundred forty-four".