21254106 has 16 divisors (see below), whose sum is σ = 42745248. Its totient is φ = 7045200.

The previous prime is 21254099. The next prime is 21254117. The reversal of 21254106 is 60145212.

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 7 ways as a sum of consecutive naturals, for example, 8700 + ... + 10871.

It is an arithmetic number, because the mean of its divisors is an integer number (2671578).

Almost surely, 2^21254106 is an apocalyptic number.

21254106 is an abundant number, since it is smaller than the sum of its proper divisors (21491142).

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

21254106 is a wasteful number, since it uses less digits than its factorization.

21254106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19757.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 21254106 is about 4610.2175653650. The cubic root of 21254106 is about 277.0007515608. Note that the first 3 decimals are identical.

Adding to 21254106 its reverse (60145212), we get a palindrome (81399318).

The spelling of 21254106 in words is "twenty-one million, two hundred fifty-four thousand, one hundred six".