1020101220 has 72 divisors (see below), whose sum is σ = 3114102264. Its totient is φ = 270286848.

The previous prime is 1020101213. The next prime is 1020101237. The reversal of 1020101220 is 221010201.

It can be written as a sum of positive squares in 4 ways, for example, as 831744 + 1019269476 = 912^2 + 31926^2 .

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

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, 10212 + ... + 46308.

Almost surely, 2^1020101220 is an apocalyptic number.

1020101220 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 1020101220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1557051132).

1020101220 is an abundant number, since it is smaller than the sum of its proper divisors (2094001044).

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

1020101220 is a wasteful number, since it uses less digits than its factorization.

1020101220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36269 (or 36264 counting only the distinct ones).

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

The square root of 1020101220 is about 31939.0234665996. The cubic root of 1020101220 is about 1006.6560059590.

Adding to 1020101220 its reverse (221010201), we get a palindrome (1241111421).

The spelling of 1020101220 in words is "one billion, twenty million, one hundred one thousand, two hundred twenty".