21150494 has 16 divisors (see below), whose sum is σ = 33125760. Its totient is φ = 10116480.

The previous prime is 21150491. The next prime is 21150523. The reversal of 21150494 is 49405112.

21150494 = T₂₅₇ + T₂₅₈ + ... + T₅₂₃.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21150491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3602 + ... + 7434.

It is an arithmetic number, because the mean of its divisors is an integer number (2070360).

Almost surely, 2^21150494 is an apocalyptic number.

21150494 is a deficient number, since it is larger than the sum of its proper divisors (11975266).

21150494 is a wasteful number, since it uses less digits than its factorization.

21150494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3955.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 21150494 is about 4598.9666230578. The cubic root of 21150494 is about 276.5498995972.

It can be divided in two parts, 211 and 50494, that added together give a palindrome (50705).

The spelling of 21150494 in words is "twenty-one million, one hundred fifty thousand, four hundred ninety-four".