21551050 has 12 divisors (see below), whose sum is σ = 40085046. Its totient is φ = 8620400.

The previous prime is 21551039. The next prime is 21551071. The reversal of 21551050 is 5015512.

It can be written as a sum of positive squares in 3 ways, for example, as 14691889 + 6859161 = 3833^2 + 2619^2 .

It is a super-2 number, since 2×21551050² = 928895512205000, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 215461 + ... + 215560.

Almost surely, 2^21551050 is an apocalyptic number.

21551050 is a deficient number, since it is larger than the sum of its proper divisors (18533996).

21551050 is a wasteful number, since it uses less digits than its factorization.

21551050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431033 (or 431028 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 19.

The square root of 21551050 is about 4642.3108469813. The cubic root of 21551050 is about 278.2847951822.

Adding to 21551050 its reverse (5015512), we get a palindrome (26566562).

The spelling of 21551050 in words is "twenty-one million, five hundred fifty-one thousand, fifty".