21572050 has 12 divisors (see below), whose sum is σ = 40124106. Its totient is φ = 8628800.

The previous prime is 21572041. The next prime is 21572051. The reversal of 21572050 is 5027512.

It can be written as a sum of positive squares in 3 ways, for example, as 10543009 + 11029041 = 3247^2 + 3321^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21572051) 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, 215671 + ... + 215770.

Almost surely, 2^21572050 is an apocalyptic number.

21572050 is a deficient number, since it is larger than the sum of its proper divisors (18552056).

21572050 is a wasteful number, since it uses less digits than its factorization.

21572050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431453 (or 431448 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 22.

The square root of 21572050 is about 4644.5721008506. The cubic root of 21572050 is about 278.3751555674.

Adding to 21572050 its reverse (5027512), we get a palindrome (26599562).

The spelling of 21572050 in words is "twenty-one million, five hundred seventy-two thousand, fifty".