21414356 has 12 divisors (see below), whose sum is σ = 39679668. Its totient is φ = 10077312.

The previous prime is 21414313. The next prime is 21414361. The reversal of 21414356 is 65341412.

It can be written as a sum of positive squares in 2 ways, for example, as 19891600 + 1522756 = 4460^2 + 1234^2 .

It is a congruent number.

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, 157391 + ... + 157526.

It is an arithmetic number, because the mean of its divisors is an integer number (3306639).

Almost surely, 2^21414356 is an apocalyptic number.

It is an amenable number.

21414356 is a deficient number, since it is larger than the sum of its proper divisors (18265312).

21414356 is a wasteful number, since it uses less digits than its factorization.

21414356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314938 (or 314936 counting only the distinct ones).

The product of its digits is 2880, while the sum is 26.

The square root of 21414356 is about 4627.5648023556. The cubic root of 21414356 is about 277.6951785461.

Adding to 21414356 its reverse (65341412), we get a palindrome (86755768).

The spelling of 21414356 in words is "twenty-one million, four hundred fourteen thousand, three hundred fifty-six".