213203121211 has 4 divisors (see below), whose sum is σ = 213210564952. Its totient is φ = 213195677472.

The previous prime is 213203121199. The next prime is 213203121227. The reversal of 213203121211 is 112121302312.

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 213203121211 - 2⁷ = 213203121083 is a prime.

It is a super-2 number, since 2×213203121211² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213203121251) 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, 3678741 + ... + 3736246.

It is an arithmetic number, because the mean of its divisors is an integer number (53302641238).

Almost surely, 2^213203121211 is an apocalyptic number.

213203121211 is a deficient number, since it is larger than the sum of its proper divisors (7443741).

213203121211 is an equidigital number, since it uses as much as digits as its factorization.

213203121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7443740.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 213203121211 its reverse (112121302312), we get a palindrome (325324423523).

The spelling of 213203121211 in words is "two hundred thirteen billion, two hundred three million, one hundred twenty-one thousand, two hundred eleven".