21406150 has 24 divisors (see below), whose sum is σ = 40667040. Its totient is φ = 8379360.

The previous prime is 21406109. The next prime is 21406153. The reversal of 21406150 is 5160412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21406153) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 2205 + ... + 6904.

It is an arithmetic number, because the mean of its divisors is an integer number (1694460).

Almost surely, 2^21406150 is an apocalyptic number.

21406150 is a deficient number, since it is larger than the sum of its proper divisors (19260890).

21406150 is a wasteful number, since it uses less digits than its factorization.

21406150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9168 (or 9163 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 21406150 is about 4626.6780739533. The cubic root of 21406150 is about 277.6597030023.

Adding to 21406150 its reverse (5160412), we get a palindrome (26566562).

The spelling of 21406150 in words is "twenty-one million, four hundred six thousand, one hundred fifty".