21221110244 has 12 divisors (see below), whose sum is σ = 37138119984. Its totient is φ = 10610218824.

The previous prime is 21221110223. The next prime is 21221110247. The reversal of 21221110244 is 44201112212.

It is not an unprimeable number, because it can be changed into a prime (21221110247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105299 + ... + 231365.

It is an arithmetic number, because the mean of its divisors is an integer number (3094843332).

Almost surely, 2^21221110244 is an apocalyptic number.

It is an amenable number.

21221110244 is a deficient number, since it is larger than the sum of its proper divisors (15917009740).

21221110244 is a wasteful number, since it uses less digits than its factorization.

21221110244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168154 (or 168152 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21221110244 its reverse (44201112212), we get a palindrome (65422222456).

The spelling of 21221110244 in words is "twenty-one billion, two hundred twenty-one million, one hundred ten thousand, two hundred forty-four".