20112121003 has 4 divisors (see below), whose sum is σ = 21659207248. Its totient is φ = 18565034760.

The previous prime is 20112120983. The next prime is 20112121019. The reversal of 20112121003 is 30012121102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20112121003 is a prime.

It is a super-2 number, since 2×20112121003² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 1547086231 = 20112121003 / (2 + 0 + 1 + 1 + 2 + 1 + 2 + 1 + 0 + 0 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20112121063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 773543103 + ... + 773543128.

It is an arithmetic number, because the mean of its divisors is an integer number (5414801812).

Almost surely, 2^20112121003 is an apocalyptic number.

20112121003 is a deficient number, since it is larger than the sum of its proper divisors (1547086245).

20112121003 is a wasteful number, since it uses less digits than its factorization.

20112121003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1547086244.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 20112121003 its reverse (30012121102), we get a palindrome (50124242105).

Subtracting 20112121003 from its reverse (30012121102), we obtain a palindrome (9900000099).

The spelling of 20112121003 in words is "twenty billion, one hundred twelve million, one hundred twenty-one thousand, three".