21213010444 has 6 divisors (see below), whose sum is σ = 37122768284. Its totient is φ = 10606505220.

The previous prime is 21213010439. The next prime is 21213010487. The reversal of 21213010444 is 44401031212.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2651626302 + ... + 2651626309.

Almost surely, 2^21213010444 is an apocalyptic number.

It is an amenable number.

21213010444 is a deficient number, since it is larger than the sum of its proper divisors (15909757840).

21213010444 is a wasteful number, since it uses less digits than its factorization.

21213010444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5303252615 (or 5303252613 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21213010444 its reverse (44401031212), we get a palindrome (65614041656).

The spelling of 21213010444 in words is "twenty-one billion, two hundred thirteen million, ten thousand, four hundred forty-four".