21455003132523 has 48 divisors (see below), whose sum is σ = 32336002258560. Its totient is φ = 14215641880896.

The previous prime is 21455003132393. The next prime is 21455003132531. The reversal of 21455003132523 is 32523130055412.

21455003132523 is a `hidden beast` number, since 2 + 1 + 45 + 50 + 0 + 313 + 252 + 3 = 666.

It is not a de Polignac number, because 21455003132523 - 2⁹ = 21455003132011 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21455003132543) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 25472143 + ... + 26300951.

It is an arithmetic number, because the mean of its divisors is an integer number (673666713720).

Almost surely, 2^{21455003132523} is an apocalyptic number.

21455003132523 is a deficient number, since it is larger than the sum of its proper divisors (10880999126037).

21455003132523 is an equidigital number, since it uses as much as digits as its factorization.

21455003132523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829478 (or 829466 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 36.

Adding to 21455003132523 its reverse (32523130055412), we get a palindrome (53978133187935).

The spelling of 21455003132523 in words is "twenty-one trillion, four hundred fifty-five billion, three million, one hundred thirty-two thousand, five hundred twenty-three".