21548354 has 4 divisors (see below), whose sum is σ = 32322534. Its totient is φ = 10774176.

The previous prime is 21548323. The next prime is 21548381. The reversal of 21548354 is 45384512.

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., 11404129 + 10144225 = 3377^2 + 3185^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21548354.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5387087 + ... + 5387090.

Almost surely, 2^21548354 is an apocalyptic number.

21548354 is a deficient number, since it is larger than the sum of its proper divisors (10774180).

21548354 is a wasteful number, since it uses less digits than its factorization.

21548354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10774179.

The product of its digits is 19200, while the sum is 32.

The square root of 21548354 is about 4642.0204652716. The cubic root of 21548354 is about 278.2731903788.

The spelling of 21548354 in words is "twenty-one million, five hundred forty-eight thousand, three hundred fifty-four".