20021000001 has 16 divisors (see below), whose sum is σ = 27371611584. Its totient is φ = 13012069824.

The previous prime is 20020999951. The next prime is 20021000047. The reversal of 20021000001 is 10000012002.

It is a happy number.

It is not a de Polignac number, because 20021000001 - 2⁹ = 20020999489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20021000101) 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, 376051 + ... + 425976.

It is an arithmetic number, because the mean of its divisors is an integer number (1710725724).

Almost surely, 2^20021000001 is an apocalyptic number.

It is an amenable number.

20021000001 is a deficient number, since it is larger than the sum of its proper divisors (7350611583).

20021000001 is a wasteful number, since it uses less digits than its factorization.

20021000001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802240.

The product of its (nonzero) digits is 4, while the sum is 6.

Adding to 20021000001 its reverse (10000012002), we get a palindrome (30021012003).

It can be divided in two parts, 2002 and 1000001, that multiplied together give a palindrome (2002002002).

The spelling of 20021000001 in words is "twenty billion, twenty-one million, one", and thus it is an aban number and an uban number.