21224642212 has 12 divisors (see below), whose sum is σ = 37151378460. Its totient is φ = 10609962656.

The previous prime is 21224642143. The next prime is 21224642269.

It is a happy number.

21224642212 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 296390656 + 20928251556 = 17216^2 + 144666^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 569287 + ... + 605422.

It is an arithmetic number, because the mean of its divisors is an integer number (3095948205).

Almost surely, 2^21224642212 is an apocalyptic number.

It is an amenable number.

21224642212 is a deficient number, since it is larger than the sum of its proper divisors (15926736248).

21224642212 is a wasteful number, since it uses less digits than its factorization.

21224642212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1179230 (or 1179228 counting only the distinct ones).

The product of its digits is 6144, while the sum is 28.

The spelling of 21224642212 in words is "twenty-one billion, two hundred twenty-four million, six hundred forty-two thousand, two hundred twelve".