1021011020001 has 40 divisors (see below), whose sum is σ = 1743221018880. Its totient is φ = 583394933952.

The previous prime is 1021011019993. The next prime is 1021011020119. The reversal of 1021011020001 is 1000201101201.

It is a happy number.

It is not a de Polignac number, because 1021011020001 - 2³ = 1021011019993 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (1021011022001) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 9550120 + ... + 9656438.

It is an arithmetic number, because the mean of its divisors is an integer number (43580525472).

Almost surely, 2^{1021011020001} is an apocalyptic number.

It is an amenable number.

1021011020001 is a deficient number, since it is larger than the sum of its proper divisors (722209998879).

1021011020001 is a wasteful number, since it uses less digits than its factorization.

1021011020001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123275 (or 123266 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 1021011020001 its reverse (1000201101201), we get a palindrome (2021212121202).

The spelling of 1021011020001 in words is "one trillion, twenty-one billion, eleven million, twenty thousand, one".