21000012132103 has 2 divisors, whose sum is σ = 21000012132104. Its totient is φ = 21000012132102.

The previous prime is 21000012132061. The next prime is 21000012132119. The reversal of 21000012132103 is 30123121000012.

It is an a-pointer prime, because the next prime (21000012132119) can be obtained adding 21000012132103 to its sum of digits (16).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21000012132103 - 2²¹ = 21000010034951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21000012112103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500006066051 + 10500006066052.

It is an arithmetic number, because the mean of its divisors is an integer number (10500006066052).

Almost surely, 2^{21000012132103} is an apocalyptic number.

21000012132103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000012132103 is an equidigital number, since it uses as much as digits as its factorization.

21000012132103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21000012132103 its reverse (30123121000012), we get a palindrome (51123133132115).

The spelling of 21000012132103 in words is "twenty-one trillion, twelve million, one hundred thirty-two thousand, one hundred three".