11211988 has 6 divisors (see below), whose sum is σ = 19620986. Its totient is φ = 5605992.

The previous prime is 11211961. The next prime is 11211989. The reversal of 11211988 is 88911211.

It can be written as a sum of positive squares in only one way, i.e., 6140484 + 5071504 = 2478^2 + 2252^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1401495 + ... + 1401502.

Almost surely, 2^11211988 is an apocalyptic number.

It is an amenable number.

11211988 is a deficient number, since it is larger than the sum of its proper divisors (8408998).

11211988 is a wasteful number, since it uses less digits than its factorization.

11211988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2803001 (or 2802999 counting only the distinct ones).

The product of its digits is 1152, while the sum is 31.

The square root of 11211988 is about 3348.4306771979. The cubic root of 11211988 is about 223.8175863989.

It can be divided in two parts, 112 and 11988, that added together give a square (12100 = 110²).

The spelling of 11211988 in words is "eleven million, two hundred eleven thousand, nine hundred eighty-eight".