213897557128 has 32 divisors (see below), whose sum is σ = 415564594200. Its totient is φ = 103092369408.

The previous prime is 213897557117. The next prime is 213897557177. The reversal of 213897557128 is 821755798312.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 59918227524 + 153979329604 = 244782^2 + 392402^2 .

It is a Harshad number since it is a multiple of its sum of digits (58).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 609801 + ... + 894232.

Almost surely, 2^213897557128 is an apocalyptic number.

It is an amenable number.

213897557128 is a deficient number, since it is larger than the sum of its proper divisors (201667037072).

213897557128 is a wasteful number, since it uses less digits than its factorization.

213897557128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1504681 (or 1504677 counting only the distinct ones).

The product of its digits is 8467200, while the sum is 58.

The spelling of 213897557128 in words is "two hundred thirteen billion, eight hundred ninety-seven million, five hundred fifty-seven thousand, one hundred twenty-eight".