21121504552103 has 2 divisors, whose sum is σ = 21121504552104. Its totient is φ = 21121504552102.

The previous prime is 21121504552039. The next prime is 21121504552153. The reversal of 21121504552103 is 30125540512112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21121504552103 - 2⁶ = 21121504552039 is a prime.

It is a super-2 number, since 2×21121504552103² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21121504552103.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21121504552153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560752276051 + 10560752276052.

It is an arithmetic number, because the mean of its divisors is an integer number (10560752276052).

Almost surely, 2^{21121504552103} is an apocalyptic number.

21121504552103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121504552103 is an equidigital number, since it uses as much as digits as its factorization.

21121504552103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12000, while the sum is 32.

The spelling of 21121504552103 in words is "twenty-one trillion, one hundred twenty-one billion, five hundred four million, five hundred fifty-two thousand, one hundred three".