21270718 has 16 divisors (see below), whose sum is σ = 37354464. Its totient is φ = 8893440.

The previous prime is 21270713. The next prime is 21270719. The reversal of 21270718 is 81707212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21270713) 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, 17955 + ... + 19102.

It is an arithmetic number, because the mean of its divisors is an integer number (2334654).

Almost surely, 2^21270718 is an apocalyptic number.

21270718 is a deficient number, since it is larger than the sum of its proper divisors (16083746).

21270718 is a wasteful number, since it uses less digits than its factorization.

21270718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37107.

The product of its (nonzero) digits is 1568, while the sum is 28.

The square root of 21270718 is about 4612.0188637949. The cubic root of 21270718 is about 277.0728997874.

The spelling of 21270718 in words is "twenty-one million, two hundred seventy thousand, seven hundred eighteen".