21054601523 has 2 divisors, whose sum is σ = 21054601524. Its totient is φ = 21054601522.

The previous prime is 21054601517. The next prime is 21054601531. The reversal of 21054601523 is 32510645012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21054601523 is a prime.

It is not a weakly prime, because it can be changed into another prime (21054601223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10527300761 + 10527300762.

It is an arithmetic number, because the mean of its divisors is an integer number (10527300762).

Almost surely, 2^21054601523 is an apocalyptic number.

21054601523 is a deficient number, since it is larger than the sum of its proper divisors (1).

21054601523 is an equidigital number, since it uses as much as digits as its factorization.

21054601523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 29.

The spelling of 21054601523 in words is "twenty-one billion, fifty-four million, six hundred one thousand, five hundred twenty-three".