21020020000001 has 16 divisors (see below), whose sum is σ = 23162614028928. Its totient is φ = 18916115712000.

The previous prime is 21020019999991. The next prime is 21020020000043. The reversal of 21020020000001 is 10000002002012.

It is a cyclic number.

It is not a de Polignac number, because 21020020000001 - 2²⁶ = 21019952891137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21020020030001) 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 15 ways as a sum of consecutive naturals, for example, 3652580 + ... + 7441866.

It is an arithmetic number, because the mean of its divisors is an integer number (1447663376808).

Almost surely, 2^{21020020000001} is an apocalyptic number.

It is an amenable number.

21020020000001 is a deficient number, since it is larger than the sum of its proper divisors (2142594028927).

21020020000001 is a wasteful number, since it uses less digits than its factorization.

21020020000001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3794392.

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

Adding to 21020020000001 its reverse (10000002002012), we get a palindrome (31020022002013).

The spelling of 21020020000001 in words is "twenty-one trillion, twenty billion, twenty million, one", and thus it is an aban number and an uban number.