21140718 has 16 divisors (see below), whose sum is σ = 42656976. Its totient is φ = 6984320.

The previous prime is 21140701. The next prime is 21140719. The reversal of 21140718 is 81704112.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21140719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14913 + ... + 16268.

It is an arithmetic number, because the mean of its divisors is an integer number (2666061).

Almost surely, 2^21140718 is an apocalyptic number.

21140718 is an abundant number, since it is smaller than the sum of its proper divisors (21516258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21140718 is a wasteful number, since it uses less digits than its factorization.

21140718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31299.

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 21140718 is about 4597.9036527531. The cubic root of 21140718 is about 276.5072848564.

The spelling of 21140718 in words is "twenty-one million, one hundred forty thousand, seven hundred eighteen".