21340110 has 32 divisors (see below), whose sum is σ = 55873152. Its totient is φ = 5173280.

The previous prime is 21340093. The next prime is 21340141. The reversal of 21340110 is 1104312.

It is a happy number.

It is a congruent number.

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, 32004 + ... + 32663.

It is an arithmetic number, because the mean of its divisors is an integer number (1746036).

Almost surely, 2^21340110 is an apocalyptic number.

21340110 is an abundant number, since it is smaller than the sum of its proper divisors (34533042).

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

21340110 is a wasteful number, since it uses less digits than its factorization.

21340110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64688.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 21340110 is about 4619.5356909542. The cubic root of 21340110 is about 277.3738733703.

Adding to 21340110 its reverse (1104312), we get a palindrome (22444422).

It can be divided in two parts, 21 and 340110, that multiplied together give a triangular number (7142310 = T₃₇₇₉).

The spelling of 21340110 in words is "twenty-one million, three hundred forty thousand, one hundred ten".