21722214 has 8 divisors (see below), whose sum is σ = 43444440. Its totient is φ = 7240736.

The previous prime is 21722213. The next prime is 21722221. The reversal of 21722214 is 41222712.

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

21722214 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21722213) 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, 1810179 + ... + 1810190.

It is an arithmetic number, because the mean of its divisors is an integer number (5430555).

Almost surely, 2^21722214 is an apocalyptic number.

21722214 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21722214 is a wasteful number, since it uses less digits than its factorization.

21722214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3620374.

The product of its digits is 448, while the sum is 21.

The square root of 21722214 is about 4660.7096026249. The cubic root of 21722214 is about 279.0195898425.

Adding to 21722214 its reverse (41222712), we get a palindrome (62944926).

The spelling of 21722214 in words is "twenty-one million, seven hundred twenty-two thousand, two hundred fourteen".