21050924 has 12 divisors (see below), whose sum is σ = 37623264. Its totient is φ = 10301424.

The previous prime is 21050923. The next prime is 21050927. The reversal of 21050924 is 42905012.

It is a self number, because there is not a number n which added to its sum of digits gives 21050924.

It is not an unprimeable number, because it can be changed into a prime (21050921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55799 + ... + 56174.

It is an arithmetic number, because the mean of its divisors is an integer number (3135272).

Almost surely, 2^21050924 is an apocalyptic number.

It is an amenable number.

21050924 is a deficient number, since it is larger than the sum of its proper divisors (16572340).

21050924 is a wasteful number, since it uses less digits than its factorization.

21050924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112024 (or 112022 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 21050924 is about 4588.1285945361. The cubic root of 21050924 is about 276.1152462771.

Adding to 21050924 its reverse (42905012), we get a palindrome (63955936).

The spelling of 21050924 in words is "twenty-one million, fifty thousand, nine hundred twenty-four".