21722202 has 16 divisors (see below), whose sum is σ = 48271680. Its totient is φ = 7240716.

The previous prime is 21722201. The next prime is 21722203. The reversal of 21722202 is 20222712.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21722201) and next prime (21722203).

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

It is not an unprimeable number, because it can be changed into a prime (21722201) 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, 201078 + ... + 201185.

It is an arithmetic number, because the mean of its divisors is an integer number (3016980).

Almost surely, 2^21722202 is an apocalyptic number.

21722202 is an abundant number, since it is smaller than the sum of its proper divisors (26549478).

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

21722202 is a wasteful number, since it uses less digits than its factorization.

21722202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402274 (or 402268 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 21722202 is about 4660.7083152671. The cubic root of 21722202 is about 279.0195384629.

Adding to 21722202 its reverse (20222712), we get a palindrome (41944914).

The spelling of 21722202 in words is "twenty-one million, seven hundred twenty-two thousand, two hundred two".