21203002554523 has 2 divisors, whose sum is σ = 21203002554524. Its totient is φ = 21203002554522.

The previous prime is 21203002554493. The next prime is 21203002554541. The reversal of 21203002554523 is 32545520030212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21203002554523 - 2¹⁷ = 21203002423451 is a prime.

It is not a weakly prime, because it can be changed into another prime (21203002554023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601501277261 + 10601501277262.

It is an arithmetic number, because the mean of its divisors is an integer number (10601501277262).

Almost surely, 2^{21203002554523} is an apocalyptic number.

21203002554523 is a deficient number, since it is larger than the sum of its proper divisors (1).

21203002554523 is an equidigital number, since it uses as much as digits as its factorization.

21203002554523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72000, while the sum is 34.

Adding to 21203002554523 its reverse (32545520030212), we get a palindrome (53748522584735).

The spelling of 21203002554523 in words is "twenty-one trillion, two hundred three billion, two million, five hundred fifty-four thousand, five hundred twenty-three".