21010344 has 32 divisors (see below), whose sum is σ = 52689120. Its totient is φ = 6981696.

The previous prime is 21010337. The next prime is 21010357. The reversal of 21010344 is 44301012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7779 + ... + 10125.

It is an arithmetic number, because the mean of its divisors is an integer number (1646535).

Almost surely, 2^21010344 is an apocalyptic number.

21010344 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21010344 is an abundant number, since it is smaller than the sum of its proper divisors (31678776).

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

21010344 is a wasteful number, since it uses less digits than its factorization.

21010344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2729 (or 2725 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21010344 is about 4583.7041789365. The cubic root of 21010344 is about 275.9377091099.

Adding to 21010344 its reverse (44301012), we get a palindrome (65311356).

The spelling of 21010344 in words is "twenty-one million, ten thousand, three hundred forty-four".