21124244442 has 32 divisors (see below), whose sum is σ = 48325974912. Its totient is φ = 6030249984.

The previous prime is 21124244437. The next prime is 21124244443. The reversal of 21124244442 is 24444242112.

It is not an unprimeable number, because it can be changed into a prime (21124244443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169683 + ... + 266534.

It is an arithmetic number, because the mean of its divisors is an integer number (1510186716).

Almost surely, 2^21124244442 is an apocalyptic number.

21124244442 is an abundant number, since it is smaller than the sum of its proper divisors (27201730470).

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

21124244442 is a wasteful number, since it uses less digits than its factorization.

21124244442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437382.

The product of its digits is 16384, while the sum is 30.

Adding to 21124244442 its reverse (24444242112), we get a palindrome (45568486554).

The spelling of 21124244442 in words is "twenty-one billion, one hundred twenty-four million, two hundred forty-four thousand, four hundred forty-two".