21351214 has 8 divisors (see below), whose sum is σ = 32055408. Its totient is φ = 10666080.

The previous prime is 21351181. The next prime is 21351217. The reversal of 21351214 is 41215312.

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 = 21351191 and 21351200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21351217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1522 + ... + 6709.

It is an arithmetic number, because the mean of its divisors is an integer number (4006926).

Almost surely, 2^21351214 is an apocalyptic number.

21351214 is a deficient number, since it is larger than the sum of its proper divisors (10704194).

21351214 is a wasteful number, since it uses less digits than its factorization.

21351214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9530.

The product of its digits is 240, while the sum is 19.

The square root of 21351214 is about 4620.7373870412. The cubic root of 21351214 is about 277.4219741133.

Adding to 21351214 its reverse (41215312), we get a palindrome (62566526).

The spelling of 21351214 in words is "twenty-one million, three hundred fifty-one thousand, two hundred fourteen".