21304137075 has 48 divisors (see below), whose sum is σ = 38080333536. Its totient is φ = 10447257600.

The previous prime is 21304137013. The next prime is 21304137079. The reversal of 21304137075 is 57073140312.

It is not a de Polignac number, because 21304137075 - 2⁹ = 21304136563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21304137079) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 208065 + ... + 293085.

It is an arithmetic number, because the mean of its divisors is an integer number (793340282).

Almost surely, 2^21304137075 is an apocalyptic number.

21304137075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21304137075 is a deficient number, since it is larger than the sum of its proper divisors (16776196461).

21304137075 is a wasteful number, since it uses less digits than its factorization.

21304137075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85304 (or 85299 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 33.

Adding to 21304137075 its reverse (57073140312), we get a palindrome (78377277387).

The spelling of 21304137075 in words is "twenty-one billion, three hundred four million, one hundred thirty-seven thousand, seventy-five".