21102850 has 12 divisors (see below), whose sum is σ = 39251394. Its totient is φ = 8441120.

The previous prime is 21102821. The next prime is 21102853. The reversal of 21102850 is 5820112.

It can be written as a sum of positive squares in 3 ways, for example, as 9467929 + 11634921 = 3077^2 + 3411^2 .

It is not an unprimeable number, because it can be changed into a prime (21102853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 210979 + ... + 211078.

Almost surely, 2^21102850 is an apocalyptic number.

21102850 is a deficient number, since it is larger than the sum of its proper divisors (18148544).

21102850 is a wasteful number, since it uses less digits than its factorization.

21102850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422069 (or 422064 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 21102850 is about 4593.7838434127. The cubic root of 21102850 is about 276.3420896476.

Adding to 21102850 its reverse (5820112), we get a palindrome (26922962).

It can be divided in two parts, 21102 and 850, that added together give a cube (21952 = 28³).

The spelling of 21102850 in words is "twenty-one million, one hundred two thousand, eight hundred fifty".