21231132103 has 2 divisors, whose sum is σ = 21231132104. Its totient is φ = 21231132102.

The previous prime is 21231132101. The next prime is 21231132107. The reversal of 21231132103 is 30123113212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21231132103 - 2¹ = 21231132101 is a prime.

Together with 21231132101, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21231132101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615566051 + 10615566052.

It is an arithmetic number, because the mean of its divisors is an integer number (10615566052).

Almost surely, 2^21231132103 is an apocalyptic number.

21231132103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21231132103 is an equidigital number, since it uses as much as digits as its factorization.

21231132103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21231132103 its reverse (30123113212), we get a palindrome (51354245315).

The spelling of 21231132103 in words is "twenty-one billion, two hundred thirty-one million, one hundred thirty-two thousand, one hundred three".