21254534 has 24 divisors (see below), whose sum is σ = 37607688. Its totient is φ = 8981280.

The previous prime is 21254491. The next prime is 21254567. The reversal of 21254534 is 43545212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5669 + ... + 8639.

It is an arithmetic number, because the mean of its divisors is an integer number (1566987).

Almost surely, 2^21254534 is an apocalyptic number.

21254534 is a deficient number, since it is larger than the sum of its proper divisors (16353154).

21254534 is a wasteful number, since it uses less digits than its factorization.

21254534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3060 (or 3053 counting only the distinct ones).

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

The square root of 21254534 is about 4610.2639837649. The cubic root of 21254534 is about 277.0026108961.

Adding to 21254534 its reverse (43545212), we get a palindrome (64799746).

The spelling of 21254534 in words is "twenty-one million, two hundred fifty-four thousand, five hundred thirty-four".