101020021220 has 12 divisors (see below), whose sum is σ = 212142044604. Its totient is φ = 40408008480.

The previous prime is 101020021189. The next prime is 101020021241. The reversal of 101020021220 is 22120020101.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 31733147044 + 69286874176 = 178138^2 + 263224^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2525500511 + ... + 2525500550.

It is an arithmetic number, because the mean of its divisors is an integer number (17678503717).

Almost surely, 2^101020021220 is an apocalyptic number.

101020021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101020021220 is an abundant number, since it is smaller than the sum of its proper divisors (111122023384).

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

101020021220 is a wasteful number, since it uses less digits than its factorization.

101020021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5051001070 (or 5051001068 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 101020021220 its reverse (22120020101), we get a palindrome (123140041321).

The spelling of 101020021220 in words is "one hundred one billion, twenty million, twenty-one thousand, two hundred twenty".