21240142103 has 2 divisors, whose sum is σ = 21240142104. Its totient is φ = 21240142102.

The previous prime is 21240142093. The next prime is 21240142129. The reversal of 21240142103 is 30124104212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21240142103 - 2⁴ = 21240142087 is a prime.

It is a super-2 number, since 2×21240142103² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21240142153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10620071051 + 10620071052.

It is an arithmetic number, because the mean of its divisors is an integer number (10620071052).

Almost surely, 2^21240142103 is an apocalyptic number.

21240142103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21240142103 is an equidigital number, since it uses as much as digits as its factorization.

21240142103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21240142103 its reverse (30124104212), we get a palindrome (51364246315).

The spelling of 21240142103 in words is "twenty-one billion, two hundred forty million, one hundred forty-two thousand, one hundred three".