20012121003 has 16 divisors (see below), whose sum is σ = 30536629760. Its totient is φ = 11419759296.

The previous prime is 20012121001. The next prime is 20012121007. The reversal of 20012121003 is 30012121002.

It is not a de Polignac number, because 20012121003 - 2¹ = 20012121001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20012121003.

It is not an unprimeable number, because it can be changed into a prime (20012121001) 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, 640138 + ... + 670671.

It is an arithmetic number, because the mean of its divisors is an integer number (1908539360).

Almost surely, 2^20012121003 is an apocalyptic number.

20012121003 is a deficient number, since it is larger than the sum of its proper divisors (10524508757).

20012121003 is a wasteful number, since it uses less digits than its factorization.

20012121003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1311546.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 20012121003 its reverse (30012121002), we get a palindrome (50024242005).

Subtracting 20012121003 from its reverse (30012121002), we obtain a palindrome (9999999999).

The spelling of 20012121003 in words is "twenty billion, twelve million, one hundred twenty-one thousand, three".