20111221003 has 2 divisors, whose sum is σ = 20111221004. Its totient is φ = 20111221002.

The previous prime is 20111220937. The next prime is 20111221021. The reversal of 20111221003 is 30012211102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20111221003 - 2²⁵ = 20077666571 is a prime.

It is a super-2 number, since 2×20111221003² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20111221103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055610501 + 10055610502.

It is an arithmetic number, because the mean of its divisors is an integer number (10055610502).

Almost surely, 2^20111221003 is an apocalyptic number.

20111221003 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111221003 is an equidigital number, since it uses as much as digits as its factorization.

20111221003 is an odious number, because the sum of its binary digits is odd.

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

Adding to 20111221003 its reverse (30012211102), we get a palindrome (50123432105).

Subtracting 20111221003 from its reverse (30012211102), we obtain a palindrome (9900990099).

The spelling of 20111221003 in words is "twenty billion, one hundred eleven million, two hundred twenty-one thousand, three".