21154850 has 12 divisors (see below), whose sum is σ = 39348114. Its totient is φ = 8461920.

The previous prime is 21154849. The next prime is 21154853. The reversal of 21154850 is 5845112.

It can be written as a sum of positive squares in 3 ways, for example, as 14799409 + 6355441 = 3847^2 + 2521^2 .

It is not an unprimeable number, because it can be changed into a prime (21154853) 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, 211499 + ... + 211598.

Almost surely, 2^21154850 is an apocalyptic number.

21154850 is a deficient number, since it is larger than the sum of its proper divisors (18193264).

21154850 is a wasteful number, since it uses less digits than its factorization.

21154850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423109 (or 423104 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 21154850 is about 4599.4401833267. The cubic root of 21154850 is about 276.5688836876.

Adding to 21154850 its reverse (5845112), we get a palindrome (26999962).

The spelling of 21154850 in words is "twenty-one million, one hundred fifty-four thousand, eight hundred fifty".