21124244042 has 32 divisors (see below), whose sum is σ = 36404121600. Its totient is φ = 9092098800.

The previous prime is 21124244041. The next prime is 21124244051. The reversal of 21124244042 is 24044242112.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21124244041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 924617 + ... + 947187.

It is an arithmetic number, because the mean of its divisors is an integer number (1137628800).

Almost surely, 2^21124244042 is an apocalyptic number.

21124244042 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21124244042 is a deficient number, since it is larger than the sum of its proper divisors (15279877558).

21124244042 is a wasteful number, since it uses less digits than its factorization.

21124244042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24842.

The product of its (nonzero) digits is 4096, while the sum is 26.

Adding to 21124244042 its reverse (24044242112), we get a palindrome (45168486154).

The spelling of 21124244042 in words is "twenty-one billion, one hundred twenty-four million, two hundred forty-four thousand, forty-two".