21424341242 has 16 divisors (see below), whose sum is σ = 33944646912. Its totient is φ = 10125531360.

The previous prime is 21424341221. The next prime is 21424341283. The reversal of 21424341242 is 24214342412.

It is a happy 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, 4015403 + ... + 4020734.

It is an arithmetic number, because the mean of its divisors is an integer number (2121540432).

Almost surely, 2^21424341242 is an apocalyptic number.

21424341242 is a deficient number, since it is larger than the sum of its proper divisors (12520305670).

21424341242 is a wasteful number, since it uses less digits than its factorization.

21424341242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8036213.

The product of its digits is 12288, while the sum is 29.

Adding to 21424341242 its reverse (24214342412), we get a palindrome (45638683654).

The spelling of 21424341242 in words is "twenty-one billion, four hundred twenty-four million, three hundred forty-one thousand, two hundred forty-two".