1012005522020 has 96 divisors (see below), whose sum is σ = 2248763489280. Its totient is φ = 381955553280.

The previous prime is 1012005521963. The next prime is 1012005522023. The reversal of 1012005522020 is 202255002101.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1012005521983 and 1012005522001.

It is not an unprimeable number, because it can be changed into a prime (1012005522023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15136184 + ... + 15202896.

It is an arithmetic number, because the mean of its divisors is an integer number (23424619680).

Almost surely, 2^{1012005522020} is an apocalyptic number.

1012005522020 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 1012005522020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1124381744640).

1012005522020 is an abundant number, since it is smaller than the sum of its proper divisors (1236757967260).

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

1012005522020 is a wasteful number, since it uses less digits than its factorization.

1012005522020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67365 (or 67363 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The spelling of 1012005522020 in words is "one trillion, twelve billion, five million, five hundred twenty-two thousand, twenty".