215400145243 has 24 divisors (see below), whose sum is σ = 232396571232. Its totient is φ = 198948402432.

The previous prime is 215400145151. The next prime is 215400145253. The reversal of 215400145243 is 342541004512.

215400145243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 215400145243 - 2²¹ = 215398048091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215400145253) 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 23 ways as a sum of consecutive naturals, for example, 17712121 + ... + 17724277.

It is an arithmetic number, because the mean of its divisors is an integer number (9683190468).

Almost surely, 2^215400145243 is an apocalyptic number.

215400145243 is a deficient number, since it is larger than the sum of its proper divisors (16996425989).

215400145243 is a wasteful number, since it uses less digits than its factorization.

215400145243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12499 (or 12420 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 215400145243 its reverse (342541004512), we get a palindrome (557941149755).

The spelling of 215400145243 in words is "two hundred fifteen billion, four hundred million, one hundred forty-five thousand, two hundred forty-three".