210540245305 has 8 divisors (see below), whose sum is σ = 272082778632. Its totient is φ = 155475873408.

The previous prime is 210540245297. The next prime is 210540245323. The reversal of 210540245305 is 503542045012.

It can be written as a sum of positive squares in 4 ways, for example, as 14489659129 + 196050586176 = 120373^2 + 442776^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 210540245305 - 2³ = 210540245297 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1619540284 + ... + 1619540413.

It is an arithmetic number, because the mean of its divisors is an integer number (34010347329).

Almost surely, 2^210540245305 is an apocalyptic number.

It is an amenable number.

210540245305 is a deficient number, since it is larger than the sum of its proper divisors (61542533327).

210540245305 is a wasteful number, since it uses less digits than its factorization.

210540245305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3239080715.

The product of its (nonzero) digits is 24000, while the sum is 31.

The spelling of 210540245305 in words is "two hundred ten billion, five hundred forty million, two hundred forty-five thousand, three hundred five".