21522003504523 has 2 divisors, whose sum is σ = 21522003504524. Its totient is φ = 21522003504522.

The previous prime is 21522003504503. The next prime is 21522003504557. The reversal of 21522003504523 is 32540530022512.

It is an a-pointer prime, because the next prime (21522003504557) can be obtained adding 21522003504523 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21522003504523 - 2⁹ = 21522003504011 is a prime.

It is not a weakly prime, because it can be changed into another prime (21522003504503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10761001752261 + 10761001752262.

It is an arithmetic number, because the mean of its divisors is an integer number (10761001752262).

Almost surely, 2^{21522003504523} is an apocalyptic number.

21522003504523 is a deficient number, since it is larger than the sum of its proper divisors (1).

21522003504523 is an equidigital number, since it uses as much as digits as its factorization.

21522003504523 is an evil number, because the sum of its binary digits is even.

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

The spelling of 21522003504523 in words is "twenty-one trillion, five hundred twenty-two billion, three million, five hundred four thousand, five hundred twenty-three".