21254124 has 12 divisors (see below), whose sum is σ = 49592984. Its totient is φ = 7084704.

The previous prime is 21254119. The next prime is 21254143. The reversal of 21254124 is 42145212.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 21254124.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 885577 + ... + 885600.

Almost surely, 2^21254124 is an apocalyptic number.

It is an amenable number.

21254124 is an abundant number, since it is smaller than the sum of its proper divisors (28338860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21254124 is a wasteful number, since it uses less digits than its factorization.

21254124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1771184 (or 1771182 counting only the distinct ones).

The product of its digits is 640, while the sum is 21.

The square root of 21254124 is about 4610.2195175501. The cubic root of 21254124 is about 277.0008297577. Note that the first 3 decimals are identical.

Adding to 21254124 its reverse (42145212), we get a palindrome (63399336).

The spelling of 21254124 in words is "twenty-one million, two hundred fifty-four thousand, one hundred twenty-four".