21540214103 has 2 divisors, whose sum is σ = 21540214104. Its totient is φ = 21540214102.

The previous prime is 21540214093. The next prime is 21540214109. The reversal of 21540214103 is 30141204512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21540214103 - 2⁸ = 21540213847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21540214109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10770107051 + 10770107052.

It is an arithmetic number, because the mean of its divisors is an integer number (10770107052).

Almost surely, 2^21540214103 is an apocalyptic number.

21540214103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21540214103 is an equidigital number, since it uses as much as digits as its factorization.

21540214103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 21540214103 its reverse (30141204512), we get a palindrome (51681418615).

The spelling of 21540214103 in words is "twenty-one billion, five hundred forty million, two hundred fourteen thousand, one hundred three".