21540703 has 8 divisors (see below), whose sum is σ = 22145760. Its totient is φ = 20939520.

The previous prime is 21540679. The next prime is 21540709. The reversal of 21540703 is 30704512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21540703 - 2¹⁷ = 21409631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21540709) 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, 13038 + ... + 14596.

It is an arithmetic number, because the mean of its divisors is an integer number (2768220).

Almost surely, 2^21540703 is an apocalyptic number.

21540703 is a deficient number, since it is larger than the sum of its proper divisors (605057).

21540703 is a wasteful number, since it uses less digits than its factorization.

21540703 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1937.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 21540703 is about 4641.1962897512. The cubic root of 21540703 is about 278.2402517421.

The spelling of 21540703 in words is "twenty-one million, five hundred forty thousand, seven hundred three".