20121244444 has 24 divisors (see below), whose sum is σ = 40285859040. Its totient is φ = 8614096896.

The previous prime is 20121244433. The next prime is 20121244459. The reversal of 20121244444 is 44444212102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

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, 360757 + ... + 412780.

It is an arithmetic number, because the mean of its divisors is an integer number (1678577460).

Almost surely, 2^20121244444 is an apocalyptic number.

It is an amenable number.

20121244444 is an abundant number, since it is smaller than the sum of its proper divisors (20164614596).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20121244444 is a wasteful number, since it uses less digits than its factorization.

20121244444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774477 (or 774475 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 28.

Adding to 20121244444 its reverse (44444212102), we get a palindrome (64565456546).

The spelling of 20121244444 in words is "twenty billion, one hundred twenty-one million, two hundred forty-four thousand, four hundred forty-four".