21523103111450 has 24 divisors (see below), whose sum is σ = 40033094626812. Its totient is φ = 8609214827520.

The previous prime is 21523103111437. The next prime is 21523103111479. The reversal of 21523103111450 is 5411130132512.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 11631694417729 + 9891408693721 = 3410527^2 + 3145061^2 .

It is a super-2 number, since 2×21523103111450² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28877882 + ... + 29613818.

Almost surely, 2^{21523103111450} is an apocalyptic number.

21523103111450 is a deficient number, since it is larger than the sum of its proper divisors (18509991515362).

21523103111450 is a wasteful number, since it uses less digits than its factorization.

21523103111450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1320866 (or 1320861 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 29.

Adding to 21523103111450 its reverse (5411130132512), we get a palindrome (26934233243962).

The spelling of 21523103111450 in words is "twenty-one trillion, five hundred twenty-three billion, one hundred three million, one hundred eleven thousand, four hundred fifty".