20021002001 has 16 divisors (see below), whose sum is σ = 26881346688. Its totient is φ = 14400720000.

The previous prime is 20021001997. The next prime is 20021002019. The reversal of 20021002001 is 10020012002.

It is a cyclic number.

It is not a de Polignac number, because 20021002001 - 2² = 20021001997 is a prime.

It is a super-2 number, since 2×20021002001² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20021002001.

It is not an unprimeable number, because it can be changed into a prime (20021002091) 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, 9999500 + ... + 10001501.

It is an arithmetic number, because the mean of its divisors is an integer number (1680084168).

Almost surely, 2^20021002001 is an apocalyptic number.

It is an amenable number.

20021002001 is a deficient number, since it is larger than the sum of its proper divisors (6860344687).

20021002001 is a wasteful number, since it uses less digits than its factorization.

20021002001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20001032.

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

Adding to 20021002001 its reverse (10020012002), we get a palindrome (30041014003).

It can be divided in two parts, 2002 and 1002001, that multiplied together give a palindrome (2006006002).

The spelling of 20021002001 in words is "twenty billion, twenty-one million, two thousand, one".