21222100444 has 24 divisors (see below), whose sum is σ = 37950732288. Its totient is φ = 10379294640.

The previous prime is 21222100429. The next prime is 21222100469. The reversal of 21222100444 is 44400122212.

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, 303549 + ... + 366859.

It is an arithmetic number, because the mean of its divisors is an integer number (1581280512).

Almost surely, 2^21222100444 is an apocalyptic number.

It is an amenable number.

21222100444 is a deficient number, since it is larger than the sum of its proper divisors (16728631844).

21222100444 is a wasteful number, since it uses less digits than its factorization.

21222100444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65145 (or 65143 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 21222100444 its reverse (44400122212), we get a palindrome (65622222656).

The spelling of 21222100444 in words is "twenty-one billion, two hundred twenty-two million, one hundred thousand, four hundred forty-four".