11211404205 has 64 divisors (see below), whose sum is σ = 20067056640. Its totient is φ = 5317853184.

The previous prime is 11211404177. The next prime is 11211404209. The reversal of 11211404205 is 50240411211.

It is not a de Polignac number, because 11211404205 - 2²² = 11207209901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211404209) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 331437 + ... + 363693.

It is an arithmetic number, because the mean of its divisors is an integer number (313547760).

Almost surely, 2^11211404205 is an apocalyptic number.

11211404205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11211404205 is a deficient number, since it is larger than the sum of its proper divisors (8855652435).

11211404205 is a wasteful number, since it uses less digits than its factorization.

11211404205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32358.

The product of its (nonzero) digits is 320, while the sum is 21.

Adding to 11211404205 its reverse (50240411211), we get a palindrome (61451815416).

It can be divided in two parts, 11211 and 404205, that added together give a triangular number (415416 = T₉₁₁).

The spelling of 11211404205 in words is "eleven billion, two hundred eleven million, four hundred four thousand, two hundred five".