211220232311 has 8 divisors (see below), whose sum is σ = 237855042048. Its totient is φ = 185824251000.

The previous prime is 211220232271. The next prime is 211220232319. The reversal of 211220232311 is 113232022112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211220232311 - 2¹⁸ = 211219970167 is a prime.

It is a super-2 number, since 2×211220232311² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211220232319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 309706745 + ... + 309707426.

It is an arithmetic number, because the mean of its divisors is an integer number (29731880256).

Almost surely, 2^211220232311 is an apocalyptic number.

211220232311 is a deficient number, since it is larger than the sum of its proper divisors (26634809737).

211220232311 is a wasteful number, since it uses less digits than its factorization.

211220232311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619414213.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 211220232311 its reverse (113232022112), we get a palindrome (324452254423).

The spelling of 211220232311 in words is "two hundred eleven billion, two hundred twenty million, two hundred thirty-two thousand, three hundred eleven".