21548434 has 8 divisors (see below), whose sum is σ = 32378940. Its totient is φ = 10755456.

The previous prime is 21548399. The next prime is 21548491. The reversal of 21548434 is 43484512.

It can be written as a sum of positive squares in 2 ways, for example, as 21132409 + 416025 = 4597^2 + 645^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21548396 and 21548405.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 7899 + ... + 10270.

Almost surely, 2^21548434 is an apocalyptic number.

21548434 is a deficient number, since it is larger than the sum of its proper divisors (10830506).

21548434 is a wasteful number, since it uses less digits than its factorization.

21548434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18764.

The product of its digits is 15360, while the sum is 31.

The square root of 21548434 is about 4642.0290822010. The cubic root of 21548434 is about 278.2735347489.

The spelling of 21548434 in words is "twenty-one million, five hundred forty-eight thousand, four hundred thirty-four".