213921649771 has 4 divisors (see below), whose sum is σ = 213922615032. Its totient is φ = 213920684512.

The previous prime is 213921649757. The next prime is 213921649789. The reversal of 213921649771 is 177946129312.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 213921649771 - 2¹³ = 213921641579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213921619771) 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, 34500 + ... + 655006.

It is an arithmetic number, because the mean of its divisors is an integer number (53480653758).

Almost surely, 2^213921649771 is an apocalyptic number.

213921649771 is a deficient number, since it is larger than the sum of its proper divisors (965261).

213921649771 is an equidigital number, since it uses as much as digits as its factorization.

213921649771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965260.

The product of its digits is 1143072, while the sum is 52.

The spelling of 213921649771 in words is "two hundred thirteen billion, nine hundred twenty-one million, six hundred forty-nine thousand, seven hundred seventy-one".