21143214 has 32 divisors (see below), whose sum is σ = 47370240. Its totient is φ = 6989976.

The previous prime is 21143207. The next prime is 21143251. The reversal of 21143214 is 41234112.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 5317 + ... + 8399.

It is an arithmetic number, because the mean of its divisors is an integer number (1480320).

Almost surely, 2^21143214 is an apocalyptic number.

21143214 is an abundant number, since it is smaller than the sum of its proper divisors (26227026).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21143214 is a wasteful number, since it uses less digits than its factorization.

21143214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3221 (or 3215 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 21143214 is about 4598.1750727870. The cubic root of 21143214 is about 276.5181664644.

Adding to 21143214 its reverse (41234112), we get a palindrome (62377326).

The spelling of 21143214 in words is "twenty-one million, one hundred forty-three thousand, two hundred fourteen".