21221350 has 24 divisors (see below), whose sum is σ = 40542048. Its totient is φ = 8258400.

The previous prime is 21221339. The next prime is 21221353. The reversal of 21221350 is 5312212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221353) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3886 + ... + 7585.

It is an arithmetic number, because the mean of its divisors is an integer number (1689252).

Almost surely, 2^21221350 is an apocalyptic number.

21221350 is a deficient number, since it is larger than the sum of its proper divisors (19320698).

21221350 is a wasteful number, since it uses less digits than its factorization.

21221350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11520 (or 11515 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 21221350 is about 4606.6636517115. The cubic root of 21221350 is about 276.8583774736.

Adding to 21221350 its reverse (5312212), we get a palindrome (26533562).

The spelling of 21221350 in words is "twenty-one million, two hundred twenty-one thousand, three hundred fifty".