1012201020 has 72 divisors (see below), whose sum is σ = 3203849376. Its totient is φ = 258183552.

The previous prime is 1012201013. The next prime is 1012201087. The reversal of 1012201020 is 201022101.

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

It is a junction number, because it is equal to n+sod(n) for n = 1012200993 and 1012201011.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 118107 + ... + 126386.

It is an arithmetic number, because the mean of its divisors is an integer number (44497908).

Almost surely, 2^1012201020 is an apocalyptic number.

1012201020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1012201020 is an abundant number, since it is smaller than the sum of its proper divisors (2191648356).

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

1012201020 is a wasteful number, since it uses less digits than its factorization.

1012201020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244531 (or 244526 counting only the distinct ones).

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

The square root of 1012201020 is about 31815.1067890711. The cubic root of 1012201020 is about 1004.0505773371.

Adding to 1012201020 its reverse (201022101), we get a palindrome (1213223121).

The spelling of 1012201020 in words is "one billion, twelve million, two hundred one thousand, twenty".