20103000021 has 24 divisors (see below), whose sum is σ = 33110826840. Its totient is φ = 11643365376.

The previous prime is 20103000007. The next prime is 20103000023. The reversal of 20103000021 is 12000030102.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 352913796 + 19750086225 = 18786^2 + 140535^2 .

It is not a de Polignac number, because 20103000021 - 2¹⁰ = 20102998997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 20102999967 and 20103000012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20103000023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5051556 + ... + 5055533.

It is an arithmetic number, because the mean of its divisors is an integer number (1379617785).

Almost surely, 2^20103000021 is an apocalyptic number.

It is an amenable number.

20103000021 is a deficient number, since it is larger than the sum of its proper divisors (13007826819).

20103000021 is a wasteful number, since it uses less digits than its factorization.

20103000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10107125 (or 10107122 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

Adding to 20103000021 its reverse (12000030102), we get a palindrome (32103030123).

The spelling of 20103000021 in words is "twenty billion, one hundred three million, twenty-one", and thus it is an aban number.