21342044042 has 16 divisors (see below), whose sum is σ = 34965000000. Its totient is φ = 9689358240.

The previous prime is 21342044041. The next prime is 21342044083. The reversal of 21342044042 is 24044024312.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21342044041) 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 7 ways as a sum of consecutive naturals, for example, 559667 + ... + 596582.

It is an arithmetic number, because the mean of its divisors is an integer number (2185312500).

Almost surely, 2^21342044042 is an apocalyptic number.

21342044042 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21342044042 is a deficient number, since it is larger than the sum of its proper divisors (13622955958).

21342044042 is a wasteful number, since it uses less digits than its factorization.

21342044042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1157101.

The product of its (nonzero) digits is 6144, while the sum is 26.

Adding to 21342044042 its reverse (24044024312), we get a palindrome (45386068354).

The spelling of 21342044042 in words is "twenty-one billion, three hundred forty-two million, forty-four thousand, forty-two".