21222842 has 8 divisors (see below), whose sum is σ = 31860000. Its totient is φ = 10602844.

The previous prime is 21222787. The next prime is 21222847. The reversal of 21222842 is 24822212.

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

It is not an unprimeable number, because it can be changed into a prime (21222847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 542 + ... + 6537.

It is an arithmetic number, because the mean of its divisors is an integer number (3982500).

Almost surely, 2^21222842 is an apocalyptic number.

21222842 is a deficient number, since it is larger than the sum of its proper divisors (10637158).

21222842 is a wasteful number, since it uses less digits than its factorization.

21222842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8580.

The product of its digits is 1024, while the sum is 23.

The square root of 21222842 is about 4606.8255881898. The cubic root of 21222842 is about 276.8648656411.

The spelling of 21222842 in words is "twenty-one million, two hundred twenty-two thousand, eight hundred forty-two".