21023350 has 12 divisors (see below), whose sum is σ = 39103524. Its totient is φ = 8409320.

The previous prime is 21023341. The next prime is 21023381. The reversal of 21023350 is 5332012.

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 5 ways as a sum of consecutive naturals, for example, 210184 + ... + 210283.

It is an arithmetic number, because the mean of its divisors is an integer number (3258627).

Almost surely, 2^21023350 is an apocalyptic number.

21023350 is a deficient number, since it is larger than the sum of its proper divisors (18080174).

21023350 is a wasteful number, since it uses less digits than its factorization.

21023350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420479 (or 420474 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 21023350 is about 4585.1226810196. The cubic root of 21023350 is about 275.9946351264.

Adding to 21023350 its reverse (5332012), we get a palindrome (26355362).

The spelling of 21023350 in words is "twenty-one million, twenty-three thousand, three hundred fifty".