21426122 has 4 divisors (see below), whose sum is σ = 32139186. Its totient is φ = 10713060.

The previous prime is 21426109. The next prime is 21426161. The reversal of 21426122 is 22162412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18498601 + 2927521 = 4301^2 + 1711^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21426094 and 21426103.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5356529 + ... + 5356532.

Almost surely, 2^21426122 is an apocalyptic number.

21426122 is a deficient number, since it is larger than the sum of its proper divisors (10713064).

21426122 is a wasteful number, since it uses less digits than its factorization.

21426122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10713063.

The product of its digits is 384, while the sum is 20.

The square root of 21426122 is about 4628.8359227780. The cubic root of 21426122 is about 277.7460285965.

Adding to 21426122 its reverse (22162412), we get a palindrome (43588534).

The spelling of 21426122 in words is "twenty-one million, four hundred twenty-six thousand, one hundred twenty-two".