1020100120021 has 16 divisors (see below), whose sum is σ = 1089126846720. Its totient is φ = 952109061120.

The previous prime is 1020100120009. The next prime is 1020100120063. The reversal of 1020100120021 is 1200210010201.

It is not a de Polignac number, because 1020100120021 - 2⁷ = 1020100119893 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 (1020100120001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 458290 + ... + 1500076.

It is an arithmetic number, because the mean of its divisors is an integer number (68070427920).

Almost surely, 2^{1020100120021} is an apocalyptic number.

It is an amenable number.

1020100120021 is a deficient number, since it is larger than the sum of its proper divisors (69026726699).

1020100120021 is a wasteful number, since it uses less digits than its factorization.

1020100120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1042284.

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

Adding to 1020100120021 its reverse (1200210010201), we get a palindrome (2220310130222).

The spelling of 1020100120021 in words is "one trillion, twenty billion, one hundred million, one hundred twenty thousand, twenty-one".