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21070850 = 252421417
BaseRepresentation
bin101000001100…
…0010000000010
31110122111202212
41100120100002
520343231400
62031342122
7344046023
oct120302002
943574685
1021070850
1110991929
127081942
134499978
142b26c4a
151cb3335
hex1418402

21070850 has 12 divisors (see below), whose sum is σ = 39191874. Its totient is φ = 8428320.

The previous prime is 21070831. The next prime is 21070853. The reversal of 21070850 is 5807012.

It can be written as a sum of positive squares in 3 ways, for example, as 17547721 + 3523129 = 4189^2 + 1877^2 .

It is not an unprimeable number, because it can be changed into a prime (21070853) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 210659 + ... + 210758.

Almost surely, 221070850 is an apocalyptic number.

21070850 is a deficient number, since it is larger than the sum of its proper divisors (18121024).

21070850 is a wasteful number, since it uses less digits than its factorization.

21070850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421429 (or 421424 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 21070850 is about 4590.2995544953. The cubic root of 21070850 is about 276.2023388493.

Adding to 21070850 its reverse (5807012), we get a palindrome (26877862).

The spelling of 21070850 in words is "twenty-one million, seventy thousand, eight hundred fifty".

Divisors: 1 2 5 10 25 50 421417 842834 2107085 4214170 10535425 21070850