21143122 has 64 divisors (see below), whose sum is σ = 43545600. Its totient is φ = 7433280.

The previous prime is 21143113. The next prime is 21143137. The reversal of 21143122 is 22134112.

It is a junction number, because it is equal to n+sod(n) for n = 21143096 and 21143105.

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 31 ways as a sum of consecutive naturals, for example, 118029 + ... + 118207.

It is an arithmetic number, because the mean of its divisors is an integer number (680400).

Almost surely, 2^21143122 is an apocalyptic number.

21143122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21143122 is an abundant number, since it is smaller than the sum of its proper divisors (22402478).

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

21143122 is a wasteful number, since it uses less digits than its factorization.

21143122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271.

The product of its digits is 96, while the sum is 16.

The square root of 21143122 is about 4598.1650688073. The cubic root of 21143122 is about 276.5177653947.

Adding to 21143122 its reverse (22134112), we get a palindrome (43277234).

The spelling of 21143122 in words is "twenty-one million, one hundred forty-three thousand, one hundred twenty-two".