20103200021 has 4 divisors (see below), whose sum is σ = 21161263200. Its totient is φ = 19045136844.

The previous prime is 20103200011. The next prime is 20103200023. The reversal of 20103200021 is 12000230102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20103200021 - 2⁶ = 20103199957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20103199975 and 20103200011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20103200023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 529031561 + ... + 529031598.

It is an arithmetic number, because the mean of its divisors is an integer number (5290315800).

Almost surely, 2^20103200021 is an apocalyptic number.

It is an amenable number.

20103200021 is a deficient number, since it is larger than the sum of its proper divisors (1058063179).

20103200021 is a wasteful number, since it uses less digits than its factorization.

20103200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058063178.

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 20103200021 its reverse (12000230102), we get a palindrome (32103430123).

The spelling of 20103200021 in words is "twenty billion, one hundred three million, two hundred thousand, twenty-one".