11215222251211 has 16 divisors (see below), whose sum is σ = 12241012750848. Its totient is φ = 10190470485600.

The previous prime is 11215222251209. The next prime is 11215222251221.

11215222251211 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 11215222251211 - 2¹ = 11215222251209 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 11215222251211.

It is not an unprimeable number, because it can be changed into a prime (11215222251221) 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, 208702216 + ... + 208755946.

It is an arithmetic number, because the mean of its divisors is an integer number (765063296928).

Almost surely, 2^{11215222251211} is an apocalyptic number.

11215222251211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11215222251211 is a deficient number, since it is larger than the sum of its proper divisors (1025790499637).

11215222251211 is a wasteful number, since it uses less digits than its factorization.

11215222251211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63042.

The product of its digits is 1600, while the sum is 28.

It can be divided in two parts, 1121522 and 2251211, that added together give a palindrome (3372733).

The spelling of 11215222251211 in words is "eleven trillion, two hundred fifteen billion, two hundred twenty-two million, two hundred fifty-one thousand, two hundred eleven".