21440106 has 32 divisors (see below), whose sum is σ = 49291200. Its totient is φ = 6899760.

The previous prime is 21440099. The next prime is 21440119. The reversal of 21440106 is 60104412.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5280 + ... + 8411.

It is an arithmetic number, because the mean of its divisors is an integer number (1540350).

Almost surely, 2^21440106 is an apocalyptic number.

21440106 is an abundant number, since it is smaller than the sum of its proper divisors (27851094).

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

21440106 is a wasteful number, since it uses less digits than its factorization.

21440106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13731 (or 13725 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 21440106 is about 4630.3462073586. The cubic root of 21440106 is about 277.8064401476.

Adding to 21440106 its reverse (60104412), we get a palindrome (81544518).

The spelling of 21440106 in words is "twenty-one million, four hundred forty thousand, one hundred six".