21222626 has 4 divisors (see below), whose sum is σ = 31833942. Its totient is φ = 10611312.

The previous prime is 21222611. The next prime is 21222653. The reversal of 21222626 is 62622212.

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., 17631601 + 3591025 = 4199^2 + 1895^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305655 + ... + 5305658.

Almost surely, 2^21222626 is an apocalyptic number.

21222626 is a deficient number, since it is larger than the sum of its proper divisors (10611316).

21222626 is a wasteful number, since it uses less digits than its factorization.

21222626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10611315.

The product of its digits is 1152, while the sum is 23.

The square root of 21222626 is about 4606.8021446552. The cubic root of 21222626 is about 276.8639263542.

Adding to 21222626 its reverse (62622212), we get a palindrome (83844838).

The spelling of 21222626 in words is "twenty-one million, two hundred twenty-two thousand, six hundred twenty-six".