21244251226 has 16 divisors (see below), whose sum is σ = 35252947008. Its totient is φ = 9520470400.

The previous prime is 21244251209. The next prime is 21244251227. The reversal of 21244251226 is 62215244212.

It is not an unprimeable number, because it can be changed into a prime (21244251227) 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, 6798775 + ... + 6801898.

It is an arithmetic number, because the mean of its divisors is an integer number (2203309188).

Almost surely, 2^21244251226 is an apocalyptic number.

21244251226 is a deficient number, since it is larger than the sum of its proper divisors (14008695782).

21244251226 is a wasteful number, since it uses less digits than its factorization.

21244251226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13600757.

The product of its digits is 15360, while the sum is 31.

Adding to 21244251226 its reverse (62215244212), we get a palindrome (83459495438).

The spelling of 21244251226 in words is "twenty-one billion, two hundred forty-four million, two hundred fifty-one thousand, two hundred twenty-six".