201101001220 has 96 divisors (see below), whose sum is σ = 512779051008. Its totient is φ = 64671393792.

The previous prime is 201101001197. The next prime is 201101001223. The reversal of 201101001220 is 22100101102.

It is a super-2 number, since 2×201101001220² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 201101001197 and 201101001206.

It is not an unprimeable number, because it can be changed into a prime (201101001223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 553149 + ... + 841531.

It is an arithmetic number, because the mean of its divisors is an integer number (5341448448).

Almost surely, 2^201101001220 is an apocalyptic number.

201101001220 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 201101001220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (256389525504).

201101001220 is an abundant number, since it is smaller than the sum of its proper divisors (311678049788).

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

201101001220 is a wasteful number, since it uses less digits than its factorization.

201101001220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288709 (or 288707 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 201101001220 its reverse (22100101102), we get a palindrome (223201102322).

The spelling of 201101001220 in words is "two hundred one billion, one hundred one million, one thousand, two hundred twenty".