21220167 has 8 divisors (see below), whose sum is σ = 28320640. Its totient is φ = 14133240.

The previous prime is 21220159. The next prime is 21220211. The reversal of 21220167 is 76102212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21220167 - 2³ = 21220159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220867) 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 7 ways as a sum of consecutive naturals, for example, 1134 + ... + 6612.

It is an arithmetic number, because the mean of its divisors is an integer number (3540080).

Almost surely, 2^21220167 is an apocalyptic number.

21220167 is a deficient number, since it is larger than the sum of its proper divisors (7100473).

21220167 is a wasteful number, since it uses less digits than its factorization.

21220167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6773.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 21220167 is about 4606.5352489697. The cubic root of 21220167 is about 276.8532328190.

Adding to 21220167 its reverse (76102212), we get a palindrome (97322379).

The spelling of 21220167 in words is "twenty-one million, two hundred twenty thousand, one hundred sixty-seven".