21551314 has 4 divisors (see below), whose sum is σ = 32326974. Its totient is φ = 10775656.

The previous prime is 21551303. The next prime is 21551317. The reversal of 21551314 is 41315512.

It is a happy number.

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., 19070689 + 2480625 = 4367^2 + 1575^2 .

It is not an unprimeable number, because it can be changed into a prime (21551317) by changing a digit.

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 as a sum of consecutive naturals, namely, 5387827 + ... + 5387830.

Almost surely, 2^21551314 is an apocalyptic number.

21551314 is a deficient number, since it is larger than the sum of its proper divisors (10775660).

21551314 is a wasteful number, since it uses less digits than its factorization.

21551314 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10775659.

The product of its digits is 600, while the sum is 22.

The square root of 21551314 is about 4642.3392810091. The cubic root of 21551314 is about 278.2859315056.

Adding to 21551314 its reverse (41315512), we get a palindrome (62866826).

It can be divided in two parts, 215 and 51314, that added together give a square (51529 = 227²).

The spelling of 21551314 in words is "twenty-one million, five hundred fifty-one thousand, three hundred fourteen".