21023330 has 16 divisors (see below), whose sum is σ = 38211264. Its totient is φ = 8327280.

The previous prime is 21023323. The next prime is 21023341. The reversal of 21023330 is 3332012.

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, 9176 + ... + 11235.

It is an arithmetic number, because the mean of its divisors is an integer number (2388204).

Almost surely, 2^21023330 is an apocalyptic number.

21023330 is a deficient number, since it is larger than the sum of its proper divisors (17187934).

21023330 is a wasteful number, since it uses less digits than its factorization.

21023330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20521.

The product of its (nonzero) digits is 108, while the sum is 14.

The square root of 21023330 is about 4585.1205000523. The cubic root of 21023330 is about 275.9945476064.

Adding to 21023330 its reverse (3332012), we get a palindrome (24355342).

The spelling of 21023330 in words is "twenty-one million, twenty-three thousand, three hundred thirty".