21321242034 has 16 divisors (see below), whose sum is σ = 43634170272. Its totient is φ = 6941799648.

The previous prime is 21321242023. The next prime is 21321242081. The reversal of 21321242034 is 43024212312.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21321241995 and 21321242013.

It is an unprimeable number.

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, 41319979 + ... + 41320494.

It is an arithmetic number, because the mean of its divisors is an integer number (2727135642).

Almost surely, 2^21321242034 is an apocalyptic number.

21321242034 is an abundant number, since it is smaller than the sum of its proper divisors (22312928238).

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

21321242034 is a wasteful number, since it uses less digits than its factorization.

21321242034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82640521.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21321242034 its reverse (43024212312), we get a palindrome (64345454346).

The spelling of 21321242034 in words is "twenty-one billion, three hundred twenty-one million, two hundred forty-two thousand, thirty-four".