21143226 has 16 divisors (see below), whose sum is σ = 45539424. Its totient is φ = 6505584.

The previous prime is 21143207. The next prime is 21143251. The reversal of 21143226 is 62234112.

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 7 ways as a sum of consecutive naturals, for example, 135456 + ... + 135611.

It is an arithmetic number, because the mean of its divisors is an integer number (2846214).

Almost surely, 2^21143226 is an apocalyptic number.

21143226 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21143226 is an abundant number, since it is smaller than the sum of its proper divisors (24396198).

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

21143226 is a wasteful number, since it uses less digits than its factorization.

21143226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271085.

The product of its digits is 576, while the sum is 21.

The square root of 21143226 is about 4598.1763776523. The cubic root of 21143226 is about 276.5182187778.

Adding to 21143226 its reverse (62234112), we get a palindrome (83377338).

The spelling of 21143226 in words is "twenty-one million, one hundred forty-three thousand, two hundred twenty-six".