21017050 has 12 divisors (see below), whose sum is σ = 39091806. Its totient is φ = 8406800.

The previous prime is 21017027. The next prime is 21017063. The reversal of 21017050 is 5071012.

It can be written as a sum of positive squares in 3 ways, for example, as 19954089 + 1062961 = 4467^2 + 1031^2 .

It is an unprimeable number.

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, 210121 + ... + 210220.

Almost surely, 2^21017050 is an apocalyptic number.

21017050 is a deficient number, since it is larger than the sum of its proper divisors (18074756).

21017050 is a wasteful number, since it uses less digits than its factorization.

21017050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420353 (or 420348 counting only the distinct ones).

The product of its (nonzero) digits is 70, while the sum is 16.

The square root of 21017050 is about 4584.4356250252. The cubic root of 21017050 is about 275.9670635625.

Adding to 21017050 its reverse (5071012), we get a palindrome (26088062).

The spelling of 21017050 in words is "twenty-one million, seventeen thousand, fifty".