21570050 has 24 divisors (see below), whose sum is σ = 40259700. Its totient is φ = 8598080.

The previous prime is 21570049. The next prime is 21570053. The reversal of 21570050 is 5007512.

It can be written as a sum of positive squares in 6 ways, for example, as 657721 + 20912329 = 811^2 + 4573^2 .

It is not an unprimeable number, because it can be changed into a prime (21570053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18896 + ... + 20004.

Almost surely, 2^21570050 is an apocalyptic number.

21570050 is a deficient number, since it is larger than the sum of its proper divisors (18689650).

21570050 is a wasteful number, since it uses less digits than its factorization.

21570050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1510 (or 1505 counting only the distinct ones).

The product of its (nonzero) digits is 350, while the sum is 20.

The square root of 21570050 is about 4644.3567907731. The cubic root of 21570050 is about 278.3665523437.

Adding to 21570050 its reverse (5007512), we get a palindrome (26577562).

The spelling of 21570050 in words is "twenty-one million, five hundred seventy thousand, fifty".