21041155423 has 2 divisors, whose sum is σ = 21041155424. Its totient is φ = 21041155422.

The previous prime is 21041155367. The next prime is 21041155463. The reversal of 21041155423 is 32455114012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21041155423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21041155391 and 21041155400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21041155463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10520577711 + 10520577712.

It is an arithmetic number, because the mean of its divisors is an integer number (10520577712).

Almost surely, 2^21041155423 is an apocalyptic number.

21041155423 is a deficient number, since it is larger than the sum of its proper divisors (1).

21041155423 is an equidigital number, since it uses as much as digits as its factorization.

21041155423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 21041155423 its reverse (32455114012), we get a palindrome (53496269435).

The spelling of 21041155423 in words is "twenty-one billion, forty-one million, one hundred fifty-five thousand, four hundred twenty-three".