1021001201020 has 24 divisors (see below), whose sum is σ = 2144334032064. Its totient is φ = 408356383296.

The previous prime is 1021001200979. The next prime is 1021001201021. The reversal of 1021001201020 is 201021001201.

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 = 1021001200988 and 1021001201006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021001201021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2565892 + ... + 2936971.

It is an arithmetic number, because the mean of its divisors is an integer number (89347251336).

Almost surely, 2^{1021001201020} is an apocalyptic number.

1021001201020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021001201020 is an abundant number, since it is smaller than the sum of its proper divisors (1123332831044).

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

1021001201020 is a wasteful number, since it uses less digits than its factorization.

1021001201020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5512149 (or 5512147 counting only the distinct ones).

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

Adding to 1021001201020 its reverse (201021001201), we get a palindrome (1222022202221).

The spelling of 1021001201020 in words is "one trillion, twenty-one billion, one million, two hundred one thousand, twenty".