21321050 has 12 divisors (see below), whose sum is σ = 39657246. Its totient is φ = 8528400.

The previous prime is 21321031. The next prime is 21321067. The reversal of 21321050 is 5012312.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 9740641 + 11580409 = 3121^2 + 3403^2 .

It is a plaindrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 213161 + ... + 213260.

Almost surely, 2^21321050 is an apocalyptic number.

21321050 is a deficient number, since it is larger than the sum of its proper divisors (18336196).

21321050 is a wasteful number, since it uses less digits than its factorization.

21321050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426433 (or 426428 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 21321050 is about 4617.4722522177. The cubic root of 21321050 is about 277.2912695979.

Adding to 21321050 its reverse (5012312), we get a palindrome (26333362).

The spelling of 21321050 in words is "twenty-one million, three hundred twenty-one thousand, fifty".