21440010 has 32 divisors (see below), whose sum is σ = 52332480. Its totient is φ = 5619968.

The previous prime is 21439997. The next prime is 21440017. The reversal of 21440010 is 1004412.

It is not an unprimeable number, because it can be changed into a prime (21440017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4287 + ... + 7826.

It is an arithmetic number, because the mean of its divisors is an integer number (1635390).

Almost surely, 2^21440010 is an apocalyptic number.

21440010 is an abundant number, since it is smaller than the sum of its proper divisors (30892470).

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

21440010 is a wasteful number, since it uses less digits than its factorization.

21440010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12182.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 21440010 is about 4630.3358409515. The cubic root of 21440010 is about 277.8060255125.

Adding to 21440010 its reverse (1004412), we get a palindrome (22444422).

The spelling of 21440010 in words is "twenty-one million, four hundred forty thousand, ten".