21020202003001 has 16 divisors (see below), whose sum is σ = 21276414628560. Its totient is φ = 20764803317760.

The previous prime is 21020202002981. The next prime is 21020202003007. The reversal of 21020202003001 is 10030020202012.

It can be written as a sum of positive squares in 8 ways, for example, as 8000842187776 + 13019359815225 = 2828576^2 + 3608235^2 .

It is a cyclic number.

It is not a de Polignac number, because 21020202003001 - 2⁷ = 21020202002873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020202003007) 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, 1000141845 + ... + 1000162861.

It is an arithmetic number, because the mean of its divisors is an integer number (1329775914285).

Almost surely, 2^{21020202003001} is an apocalyptic number.

It is an amenable number.

21020202003001 is a deficient number, since it is larger than the sum of its proper divisors (256212625559).

21020202003001 is a wasteful number, since it uses less digits than its factorization.

21020202003001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39804.

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 21020202003001 its reverse (10030020202012), we get a palindrome (31050222205013).

The spelling of 21020202003001 in words is "twenty-one trillion, twenty billion, two hundred two million, three thousand, one".