21203002554541 has 2 divisors, whose sum is σ = 21203002554542. Its totient is φ = 21203002554540.

The previous prime is 21203002554523. The next prime is 21203002554577. The reversal of 21203002554541 is 14545520030212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21196401642025 + 6600912516 = 4603955^2 + 81246^2 .

It is a cyclic number.

It is not a de Polignac number, because 21203002554541 - 2²³ = 21202994165933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21203002554497 and 21203002554506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21203002554581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601501277270 + 10601501277271.

It is an arithmetic number, because the mean of its divisors is an integer number (10601501277271).

Almost surely, 2^{21203002554541} is an apocalyptic number.

It is an amenable number.

21203002554541 is a deficient number, since it is larger than the sum of its proper divisors (1).

21203002554541 is an equidigital number, since it uses as much as digits as its factorization.

21203002554541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48000, while the sum is 34.

Adding to 21203002554541 its reverse (14545520030212), we get a palindrome (35748522584753).

The spelling of 21203002554541 in words is "twenty-one trillion, two hundred three billion, two million, five hundred fifty-four thousand, five hundred forty-one".