11221988 has 6 divisors (see below), whose sum is σ = 19638486. Its totient is φ = 5610992.

The previous prime is 11221967. The next prime is 11221993. The reversal of 11221988 is 88912211.

It can be written as a sum of positive squares in only one way, i.e., 6390784 + 4831204 = 2528^2 + 2198^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1402745 + ... + 1402752.

It is an arithmetic number, because the mean of its divisors is an integer number (3273081).

Almost surely, 2^11221988 is an apocalyptic number.

It is an amenable number.

11221988 is a deficient number, since it is larger than the sum of its proper divisors (8416498).

11221988 is a wasteful number, since it uses less digits than its factorization.

11221988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2805501 (or 2805499 counting only the distinct ones).

The product of its digits is 2304, while the sum is 32.

The square root of 11221988 is about 3349.9235812179. The cubic root of 11221988 is about 223.8841077801.

The spelling of 11221988 in words is "eleven million, two hundred twenty-one thousand, nine hundred eighty-eight".