213120021311 has 16 divisors (see below), whose sum is σ = 216886118400. Its totient is φ = 209376367200.

The previous prime is 213120021287. The next prime is 213120021329. The reversal of 213120021311 is 113120021312.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213120021311 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213120021311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213120021391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29477645 + ... + 29484873.

It is an arithmetic number, because the mean of its divisors is an integer number (13555382400).

Almost surely, 2^213120021311 is an apocalyptic number.

213120021311 is a deficient number, since it is larger than the sum of its proper divisors (3766097089).

213120021311 is an equidigital number, since it uses as much as digits as its factorization.

213120021311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8710.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 213120021311 its reverse (113120021312), we get a palindrome (326240042623).

Subtracting from 213120021311 its reverse (113120021312), we obtain a palindrome (99999999999).

The spelling of 213120021311 in words is "two hundred thirteen billion, one hundred twenty million, twenty-one thousand, three hundred eleven".