21344442212 has 24 divisors (see below), whose sum is σ = 37749811680. Its totient is φ = 10558851840.

The previous prime is 21344442199. The next prime is 21344442241. The reversal of 21344442212 is 21224444312.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1599287 + ... + 1612577.

It is an arithmetic number, because the mean of its divisors is an integer number (1572908820).

Almost surely, 2^21344442212 is an apocalyptic number.

It is an amenable number.

21344442212 is a deficient number, since it is larger than the sum of its proper divisors (16405369468).

21344442212 is a wasteful number, since it uses less digits than its factorization.

21344442212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17531 (or 17529 counting only the distinct ones).

The product of its digits is 12288, while the sum is 29.

Adding to 21344442212 its reverse (21224444312), we get a palindrome (42568886524).

The spelling of 21344442212 in words is "twenty-one billion, three hundred forty-four million, four hundred forty-two thousand, two hundred twelve".