21123131222003 has 2 divisors, whose sum is σ = 21123131222004. Its totient is φ = 21123131222002.

The previous prime is 21123131221999. The next prime is 21123131222029. The reversal of 21123131222003 is 30022213132112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21123131222003 - 2² = 21123131221999 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21123131222003.

It is not a weakly prime, because it can be changed into another prime (21123131222803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561565611001 + 10561565611002.

It is an arithmetic number, because the mean of its divisors is an integer number (10561565611002).

Almost surely, 2^{21123131222003} is an apocalyptic number.

21123131222003 is a deficient number, since it is larger than the sum of its proper divisors (1).

21123131222003 is an equidigital number, since it uses as much as digits as its factorization.

21123131222003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21123131222003 its reverse (30022213132112), we get a palindrome (51145344354115).

The spelling of 21123131222003 in words is "twenty-one trillion, one hundred twenty-three billion, one hundred thirty-one million, two hundred twenty-two thousand, three".