21354524 has 6 divisors (see below), whose sum is σ = 37370424. Its totient is φ = 10677260.

The previous prime is 21354451. The next prime is 21354551. The reversal of 21354524 is 42545312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21354493 and 21354502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2669312 + ... + 2669319.

It is an arithmetic number, because the mean of its divisors is an integer number (6228404).

Almost surely, 2^21354524 is an apocalyptic number.

It is an amenable number.

21354524 is a deficient number, since it is larger than the sum of its proper divisors (16015900).

21354524 is a wasteful number, since it uses less digits than its factorization.

21354524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5338635 (or 5338633 counting only the distinct ones).

The product of its digits is 4800, while the sum is 26.

The square root of 21354524 is about 4621.0955411028. The cubic root of 21354524 is about 277.4363092745.

Adding to 21354524 its reverse (42545312), we get a palindrome (63899836).

The spelling of 21354524 in words is "twenty-one million, three hundred fifty-four thousand, five hundred twenty-four".