1021001020021 has 4 divisors (see below), whose sum is σ = 1027114798752. Its totient is φ = 1014887241292.

The previous prime is 1021001020003. The next prime is 1021001020033. The reversal of 1021001020021 is 1200201001201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1021001020021 - 2⁵ = 1021001019989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021001020001) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3056889115 + ... + 3056889448.

It is an arithmetic number, because the mean of its divisors is an integer number (256778699688).

Almost surely, 2^{1021001020021} is an apocalyptic number.

It is an amenable number.

1021001020021 is a deficient number, since it is larger than the sum of its proper divisors (6113778731).

1021001020021 is an equidigital number, since it uses as much as digits as its factorization.

1021001020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6113778730.

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

Adding to 1021001020021 its reverse (1200201001201), we get a palindrome (2221202021222).

The spelling of 1021001020021 in words is "one trillion, twenty-one billion, one million, twenty thousand, twenty-one".