21222349 has 8 divisors (see below), whose sum is σ = 22304480. Its totient is φ = 20167056.

The previous prime is 21222347. The next prime is 21222361. The reversal of 21222349 is 94322212.

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

It is a cyclic number.

It is not a de Polignac number, because 21222349 - 2¹ = 21222347 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 (21222343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5079 + ... + 8260.

It is an arithmetic number, because the mean of its divisors is an integer number (2788060).

Almost surely, 2^21222349 is an apocalyptic number.

It is an amenable number.

21222349 is a deficient number, since it is larger than the sum of its proper divisors (1082131).

21222349 is a wasteful number, since it uses less digits than its factorization.

21222349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13419.

The product of its digits is 1728, while the sum is 25.

The square root of 21222349 is about 4606.7720803183. The cubic root of 21222349 is about 276.8627217964.

The spelling of 21222349 in words is "twenty-one million, two hundred twenty-two thousand, three hundred forty-nine".