21312012226 has 64 divisors (see below), whose sum is σ = 35971499520. Its totient is φ = 9410826240.

The previous prime is 21312012203. The next prime is 21312012269. The reversal of 21312012226 is 62221021312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21312012197 and 21312012206.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57136576 + ... + 57136948.

It is an arithmetic number, because the mean of its divisors is an integer number (562054680).

Almost surely, 2^21312012226 is an apocalyptic number.

21312012226 is a deficient number, since it is larger than the sum of its proper divisors (14659487294).

21312012226 is a wasteful number, since it uses less digits than its factorization.

21312012226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1019.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21312012226 its reverse (62221021312), we get a palindrome (83533033538).

The spelling of 21312012226 in words is "twenty-one billion, three hundred twelve million, twelve thousand, two hundred twenty-six".