21455050 has 12 divisors (see below), whose sum is σ = 39906486. Its totient is φ = 8582000.

The previous prime is 21455039. The next prime is 21455051. The reversal of 21455050 is 5055412.

It can be written as a sum of positive squares in 3 ways, for example, as 15139881 + 6315169 = 3891^2 + 2513^2 .

It is not an unprimeable number, because it can be changed into a prime (21455051) by changing a digit.

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, 214501 + ... + 214600.

Almost surely, 2^21455050 is an apocalyptic number.

21455050 is a deficient number, since it is larger than the sum of its proper divisors (18451436).

21455050 is a wasteful number, since it uses less digits than its factorization.

21455050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429113 (or 429108 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 21455050 is about 4631.9596284942. The cubic root of 21455050 is about 277.8709699165.

The spelling of 21455050 in words is "twenty-one million, four hundred fifty-five thousand, fifty".