21320243034 has 16 divisors (see below), whose sum is σ = 43154227872. Its totient is φ = 7021124048.

The previous prime is 21320243029. The next prime is 21320243039. The reversal of 21320243034 is 43034202312.

It is an interprime number because it is at equal distance from previous prime (21320243029) and next prime (21320243039).

It is a junction number, because it is equal to n+sod(n) for n = 21320242995 and 21320243013.

It is not an unprimeable number, because it can be changed into a prime (21320243039) 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, 21405369 + ... + 21406364.

It is an arithmetic number, because the mean of its divisors is an integer number (2697139242).

Almost surely, 2^21320243034 is an apocalyptic number.

21320243034 is an abundant number, since it is smaller than the sum of its proper divisors (21833984838).

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

21320243034 is a wasteful number, since it uses less digits than its factorization.

21320243034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42811821.

The product of its (nonzero) digits is 3456, while the sum is 24.

Adding to 21320243034 its reverse (43034202312), we get a palindrome (64354445346).

The spelling of 21320243034 in words is "twenty-one billion, three hundred twenty million, two hundred forty-three thousand, thirty-four".