21457102 has 8 divisors (see below), whose sum is σ = 32207112. Its totient is φ = 10721400.

The previous prime is 21457087. The next prime is 21457133. The reversal of 21457102 is 20175412.

It is a happy number.

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, 1777 + ... + 6787.

It is an arithmetic number, because the mean of its divisors is an integer number (4025889).

Almost surely, 2^21457102 is an apocalyptic number.

21457102 is a deficient number, since it is larger than the sum of its proper divisors (10750010).

21457102 is a wasteful number, since it uses less digits than its factorization.

21457102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7154.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 21457102 is about 4632.1811277194. The cubic root of 21457102 is about 277.8798283291.

The spelling of 21457102 in words is "twenty-one million, four hundred fifty-seven thousand, one hundred two".