21254102 has 8 divisors (see below), whose sum is σ = 32059800. Its totient is φ = 10567504.

The previous prime is 21254099. The next prime is 21254117. The reversal of 21254102 is 20145212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

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, 29327 + ... + 30042.

It is an arithmetic number, because the mean of its divisors is an integer number (4007475).

Almost surely, 2^21254102 is an apocalyptic number.

21254102 is a deficient number, since it is larger than the sum of its proper divisors (10805698).

21254102 is a wasteful number, since it uses less digits than its factorization.

21254102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59550.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 21254102 is about 4610.2171315460. The cubic root of 21254102 is about 277.0007341837. Note that the first 3 decimals are identical.

Adding to 21254102 its reverse (20145212), we get a palindrome (41399314).

The spelling of 21254102 in words is "twenty-one million, two hundred fifty-four thousand, one hundred two".