21730353275 has 12 divisors (see below), whose sum is σ = 28530676152. Its totient is φ = 16361677440.

The previous prime is 21730353263. The next prime is 21730353299. The reversal of 21730353275 is 57235303712.

It is not a de Polignac number, because 21730353275 - 2²⁸ = 21461917819 is a prime.

It is a Duffinian number.

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 11 ways as a sum of consecutive naturals, for example, 25564697 + ... + 25565546.

It is an arithmetic number, because the mean of its divisors is an integer number (2377556346).

Almost surely, 2^21730353275 is an apocalyptic number.

21730353275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21730353275 is a deficient number, since it is larger than the sum of its proper divisors (6800322877).

21730353275 is a wasteful number, since it uses less digits than its factorization.

21730353275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51130270 (or 51130265 counting only the distinct ones).

The product of its (nonzero) digits is 132300, while the sum is 38.

Adding to 21730353275 its reverse (57235303712), we get a palindrome (78965656987).

The spelling of 21730353275 in words is "twenty-one billion, seven hundred thirty million, three hundred fifty-three thousand, two hundred seventy-five".