21420323342 has 16 divisors (see below), whose sum is σ = 35073637632. Its totient is φ = 9730344120.

The previous prime is 21420323329. The next prime is 21420323347. The reversal of 21420323342 is 24332302412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21420323347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 272708 + ... + 342359.

It is an arithmetic number, because the mean of its divisors is an integer number (2192102352).

Almost surely, 2^21420323342 is an apocalyptic number.

21420323342 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21420323342 is a deficient number, since it is larger than the sum of its proper divisors (13653314290).

21420323342 is a wasteful number, since it uses less digits than its factorization.

21420323342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616663.

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 21420323342 its reverse (24332302412), we get a palindrome (45752625754).

The spelling of 21420323342 in words is "twenty-one billion, four hundred twenty million, three hundred twenty-three thousand, three hundred forty-two".