21553414 has 4 divisors (see below), whose sum is σ = 32330124. Its totient is φ = 10776706.

The previous prime is 21553403. The next prime is 21553417. The reversal of 21553414 is 41435512.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21553417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5388352 + ... + 5388355.

It is an arithmetic number, because the mean of its divisors is an integer number (8082531).

Almost surely, 2^21553414 is an apocalyptic number.

21553414 is a deficient number, since it is larger than the sum of its proper divisors (10776710).

21553414 is a wasteful number, since it uses less digits than its factorization.

21553414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10776709.

The product of its digits is 2400, while the sum is 25.

The square root of 21553414 is about 4642.5654545736. The cubic root of 21553414 is about 278.2949701111.

Adding to 21553414 its reverse (41435512), we get a palindrome (62988926).

The spelling of 21553414 in words is "twenty-one million, five hundred fifty-three thousand, four hundred fourteen".