21313231103 has 2 divisors, whose sum is σ = 21313231104. Its totient is φ = 21313231102.

The previous prime is 21313231099. The next prime is 21313231157. The reversal of 21313231103 is 30113231312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21313231103 - 2² = 21313231099 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21313231003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656615551 + 10656615552.

It is an arithmetic number, because the mean of its divisors is an integer number (10656615552).

Almost surely, 2^21313231103 is an apocalyptic number.

21313231103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21313231103 is an equidigital number, since it uses as much as digits as its factorization.

21313231103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 21313231103 its reverse (30113231312), we get a palindrome (51426462415).

The spelling of 21313231103 in words is "twenty-one billion, three hundred thirteen million, two hundred thirty-one thousand, one hundred three".