21540914 has 4 divisors (see below), whose sum is σ = 32311374. Its totient is φ = 10770456.

The previous prime is 21540901. The next prime is 21540917. The reversal of 21540914 is 41904512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 13446889 + 8094025 = 3667^2 + 2845^2 .

It is a super-3 number, since 3×21540914³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21540917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5385227 + ... + 5385230.

Almost surely, 2^21540914 is an apocalyptic number.

21540914 is a deficient number, since it is larger than the sum of its proper divisors (10770460).

21540914 is a wasteful number, since it uses less digits than its factorization.

21540914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10770459.

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

The square root of 21540914 is about 4641.2190209039. The cubic root of 21540914 is about 278.2411602315.

The spelling of 21540914 in words is "twenty-one million, five hundred forty thousand, nine hundred fourteen".