21244224212 has 24 divisors (see below), whose sum is σ = 37834008576. Its totient is φ = 10436132448.

The previous prime is 21244224179. The next prime is 21244224269. The reversal of 21244224212 is 21242244212.

It is a nude number because it is divisible by every one of its digits.

It is a congruent 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, 150683 + ... + 255330.

It is an arithmetic number, because the mean of its divisors is an integer number (1576417024).

Almost surely, 2^21244224212 is an apocalyptic number.

It is an amenable number.

21244224212 is a deficient number, since it is larger than the sum of its proper divisors (16589784364).

21244224212 is a wasteful number, since it uses less digits than its factorization.

21244224212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406247 (or 406245 counting only the distinct ones).

The product of its digits is 4096, while the sum is 26.

Adding to 21244224212 its reverse (21242244212), we get a palindrome (42486468424).

The spelling of 21244224212 in words is "twenty-one billion, two hundred forty-four million, two hundred twenty-four thousand, two hundred twelve".