21065050 has 24 divisors (see below), whose sum is σ = 39302172. Its totient is φ = 8400000.

The previous prime is 21065041. The next prime is 21065059. The reversal of 21065050 is 5056012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21065041) and next prime (21065059).

It can be written as a sum of positive squares in 6 ways, for example, as 15547249 + 5517801 = 3943^2 + 2349^2 .

It is not an unprimeable number, because it can be changed into a prime (21065059) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29700 + ... + 30400.

Almost surely, 2^21065050 is an apocalyptic number.

21065050 is a deficient number, since it is larger than the sum of its proper divisors (18237122).

21065050 is a wasteful number, since it uses less digits than its factorization.

21065050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1314 (or 1309 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 21065050 is about 4589.6677439658. The cubic root of 21065050 is about 276.1769938731.

The spelling of 21065050 in words is "twenty-one million, sixty-five thousand, fifty".