21422122 has 8 divisors (see below), whose sum is σ = 32494500. Its totient is φ = 10590624.

The previous prime is 21422119. The next prime is 21422129. The reversal of 21422122 is 22122412.

It can be written as a sum of positive squares in 2 ways, for example, as 21261321 + 160801 = 4611^2 + 401^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21422096 and 21422105.

It is not an unprimeable number, because it can be changed into a prime (21422129) 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, 59997 + ... + 60352.

Almost surely, 2^21422122 is an apocalyptic number.

21422122 is a deficient number, since it is larger than the sum of its proper divisors (11072378).

21422122 is a wasteful number, since it uses less digits than its factorization.

21422122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120440.

The product of its digits is 128, while the sum is 16.

The square root of 21422122 is about 4628.4038285353. The cubic root of 21422122 is about 277.7287435700.

Adding to 21422122 its reverse (22122412), we get a palindrome (43544534).

The spelling of 21422122 in words is "twenty-one million, four hundred twenty-two thousand, one hundred twenty-two".