21625850 has 24 divisors (see below), whose sum is σ = 40346748. Its totient is φ = 8624000.

The previous prime is 21625841. The next prime is 21625889. The reversal of 21625850 is 5852612.

It can be written as a sum of positive squares in 6 ways, for example, as 5697769 + 15928081 = 2387^2 + 3991^2 .

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30500 + ... + 31200.

Almost surely, 2^21625850 is an apocalyptic number.

21625850 is a deficient number, since it is larger than the sum of its proper divisors (18720898).

21625850 is a wasteful number, since it uses less digits than its factorization.

21625850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1330 (or 1325 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 21625850 is about 4650.3602011027. The cubic root of 21625850 is about 278.6063830156.

The spelling of 21625850 in words is "twenty-one million, six hundred twenty-five thousand, eight hundred fifty".