20104001021 has 16 divisors (see below), whose sum is σ = 21821553600. Its totient is φ = 18411055488.

The previous prime is 20104001011. The next prime is 20104001107. The reversal of 20104001021 is 12010040102.

It is a cyclic number.

It is not a de Polignac number, because 20104001021 - 2¹⁸ = 20103738877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20104000993 and 20104001011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20104001011) 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, 5374970 + ... + 5378708.

It is an arithmetic number, because the mean of its divisors is an integer number (1363847100).

Almost surely, 2^20104001021 is an apocalyptic number.

It is an amenable number.

20104001021 is a deficient number, since it is larger than the sum of its proper divisors (1717552579).

20104001021 is a wasteful number, since it uses less digits than its factorization.

20104001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6908.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20104001021 its reverse (12010040102), we get a palindrome (32114041123).

The spelling of 20104001021 in words is "twenty billion, one hundred four million, one thousand, twenty-one".