101012220 has 144 divisors (see below), whose sum is σ = 326158560. Its totient is φ = 25256448.

The previous prime is 101012207. The next prime is 101012231. The reversal of 101012220 is 22210101.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 192879 + ... + 193401.

It is an arithmetic number, because the mean of its divisors is an integer number (2264990).

Almost surely, 2^101012220 is an apocalyptic number.

101012220 is a gapful number since it is divisible by the number (10) 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 101012220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (163079280).

101012220 is an abundant number, since it is smaller than the sum of its proper divisors (225146340).

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

101012220 is a wasteful number, since it uses less digits than its factorization.

101012220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604 (or 599 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 101012220 is about 10050.4835704557. The cubic root of 101012220 is about 465.7197317577.

Adding to 101012220 its reverse (22210101), we get a palindrome (123222321).

It can be divided in two parts, 10101 and 2220, that added together give a palindrome (12321).

The spelling of 101012220 in words is "one hundred one million, twelve thousand, two hundred twenty".