21404102 has 8 divisors (see below), whose sum is σ = 32512800. Its totient is φ = 10566504.

The previous prime is 21404101. The next prime is 21404147. The reversal of 21404102 is 20140412.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21404101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67577 + ... + 67892.

It is an arithmetic number, because the mean of its divisors is an integer number (4064100).

Almost surely, 2^21404102 is an apocalyptic number.

21404102 is a deficient number, since it is larger than the sum of its proper divisors (11108698).

21404102 is a wasteful number, since it uses less digits than its factorization.

21404102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135550.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 21404102 is about 4626.4567435566. The cubic root of 21404102 is about 277.6508478337.

Adding to 21404102 its reverse (20140412), we get a palindrome (41544514).

It can be divided in two parts, 2140410 and 2, that added together give a palindrome (2140412).

The spelling of 21404102 in words is "twenty-one million, four hundred four thousand, one hundred two".