1012021001020 has 96 divisors (see below), whose sum is σ = 2171799092736. Its totient is φ = 396033580800.

The previous prime is 1012021000999. The next prime is 1012021001081. The reversal of 1012021001020 is 201001202101.

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 = 1012021000988 and 1012021001006.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 117933130 + ... + 117941710.

It is an arithmetic number, because the mean of its divisors is an integer number (22622907216).

Almost surely, 2^{1012021001020} is an apocalyptic number.

1012021001020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1012021001020 is an abundant number, since it is smaller than the sum of its proper divisors (1159778091716).

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

1012021001020 is a wasteful number, since it uses less digits than its factorization.

1012021001020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9251 (or 9249 counting only the distinct ones).

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

Adding to 1012021001020 its reverse (201001202101), we get a palindrome (1213022203121).

The spelling of 1012021001020 in words is "one trillion, twelve billion, twenty-one million, one thousand, twenty".