21240552103 has 2 divisors, whose sum is σ = 21240552104. Its totient is φ = 21240552102.

The previous prime is 21240552083. The next prime is 21240552107. The reversal of 21240552103 is 30125504212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21240552103 is a prime.

It is a super-2 number, since 2×21240552103² (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 (21240552107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10620276051 + 10620276052.

It is an arithmetic number, because the mean of its divisors is an integer number (10620276052).

Almost surely, 2^21240552103 is an apocalyptic number.

21240552103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21240552103 is an equidigital number, since it uses as much as digits as its factorization.

21240552103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2400, while the sum is 25.

The spelling of 21240552103 in words is "twenty-one billion, two hundred forty million, five hundred fifty-two thousand, one hundred three".