21371124 has 48 divisors (see below), whose sum is σ = 53312000. Its totient is φ = 6643296.

The previous prime is 21371113. The next prime is 21371153. The reversal of 21371124 is 42117312.

It is a self number, because there is not a number n which added to its sum of digits gives 21371124.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14577 + ... + 15975.

Almost surely, 2^21371124 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21371124, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26656000).

21371124 is an abundant number, since it is smaller than the sum of its proper divisors (31940876).

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

21371124 is a wasteful number, since it uses less digits than its factorization.

21371124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1492 (or 1490 counting only the distinct ones).

The product of its digits is 336, while the sum is 21.

The square root of 21371124 is about 4622.8913030700. The cubic root of 21371124 is about 277.5081792898.

Adding to 21371124 its reverse (42117312), we get a palindrome (63488436).

The spelling of 21371124 in words is "twenty-one million, three hundred seventy-one thousand, one hundred twenty-four".