21143078 has 16 divisors (see below), whose sum is σ = 35252496. Its totient is φ = 9428640.

The previous prime is 21143071. The next prime is 21143081. The reversal of 21143078 is 87034112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21143071) 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 7 ways as a sum of consecutive naturals, for example, 7901 + ... + 10232.

It is an arithmetic number, because the mean of its divisors is an integer number (2203281).

Almost surely, 2^21143078 is an apocalyptic number.

21143078 is a deficient number, since it is larger than the sum of its proper divisors (14109418).

21143078 is a wasteful number, since it uses less digits than its factorization.

21143078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18199.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 21143078 is about 4598.1602842876. The cubic root of 21143078 is about 276.5175735784.

The spelling of 21143078 in words is "twenty-one million, one hundred forty-three thousand, seventy-eight".