20103100021 has 16 divisors (see below), whose sum is σ = 21135945600. Its totient is φ = 19083980608.

The previous prime is 20103100009. The next prime is 20103100057. The reversal of 20103100021 is 12000130102.

It is a cyclic number.

It is not a de Polignac number, because 20103100021 - 2¹³ = 20103091829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20103099980 and 20103100007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20103100091) 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, 1893195 + ... + 1903783.

It is an arithmetic number, because the mean of its divisors is an integer number (1320996600).

Almost surely, 2^20103100021 is an apocalyptic number.

It is an amenable number.

20103100021 is a deficient number, since it is larger than the sum of its proper divisors (1032845579).

20103100021 is a wasteful number, since it uses less digits than its factorization.

20103100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11228.

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 20103100021 its reverse (12000130102), we get a palindrome (32103230123).

The spelling of 20103100021 in words is "twenty billion, one hundred three million, one hundred thousand, twenty-one".