213481857415 has 4 divisors (see below), whose sum is σ = 256178228904. Its totient is φ = 170785485928.

The previous prime is 213481857403. The next prime is 213481857419. The reversal of 213481857415 is 514758184312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 213481857415 - 2³⁵ = 179122119047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213481857419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21348185737 + ... + 21348185746.

It is an arithmetic number, because the mean of its divisors is an integer number (64044557226).

Almost surely, 2^213481857415 is an apocalyptic number.

213481857415 is a deficient number, since it is larger than the sum of its proper divisors (42696371489).

213481857415 is an equidigital number, since it uses as much as digits as its factorization.

213481857415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42696371488.

The product of its digits is 1075200, while the sum is 49.

The spelling of 213481857415 in words is "two hundred thirteen billion, four hundred eighty-one million, eight hundred fifty-seven thousand, four hundred fifteen".