211220252311 has 32 divisors (see below), whose sum is σ = 221778321408. Its totient is φ = 200999554560.

The previous prime is 211220252303. The next prime is 211220252329. The reversal of 211220252311 is 113252022112.

It is not a de Polignac number, because 211220252311 - 2³ = 211220252303 is a prime.

It is a super-2 number, since 2×211220252311² (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 (211220256311) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 98104011 + ... + 98106163.

It is an arithmetic number, because the mean of its divisors is an integer number (6930572544).

Almost surely, 2^211220252311 is an apocalyptic number.

211220252311 is a deficient number, since it is larger than the sum of its proper divisors (10558069097).

211220252311 is a wasteful number, since it uses less digits than its factorization.

211220252311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2631.

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 211220252311 its reverse (113252022112), we get a palindrome (324472274423).

The spelling of 211220252311 in words is "two hundred eleven billion, two hundred twenty million, two hundred fifty-two thousand, three hundred eleven".