21010144 has 24 divisors (see below), whose sum is σ = 42328440. Its totient is φ = 10260096.

The previous prime is 21010127. The next prime is 21010153. The reversal of 21010144 is 44101012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6259 + ... + 9010.

It is an arithmetic number, because the mean of its divisors is an integer number (1763685).

Almost surely, 2^21010144 is an apocalyptic number.

It is an amenable number.

21010144 is an abundant number, since it is smaller than the sum of its proper divisors (21318296).

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

21010144 is a wasteful number, since it uses less digits than its factorization.

21010144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15322 (or 15314 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 21010144 is about 4583.6823624680. The cubic root of 21010144 is about 275.9368335457.

Adding to 21010144 its reverse (44101012), we get a palindrome (65111156).

The spelling of 21010144 in words is "twenty-one million, ten thousand, one hundred forty-four".