2211111988 has 6 divisors (see below), whose sum is σ = 3869445986. Its totient is φ = 1105555992.

The previous prime is 2211111967. The next prime is 2211111997. The reversal of 2211111988 is 8891111122.

It can be written as a sum of positive squares in only one way, i.e., 1855714084 + 355397904 = 43078^2 + 18852^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 276388995 + ... + 276389002.

Almost surely, 2^2211111988 is an apocalyptic number.

It is an amenable number.

2211111988 is a deficient number, since it is larger than the sum of its proper divisors (1658333998).

2211111988 is a wasteful number, since it uses less digits than its factorization.

2211111988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552778001 (or 552777999 counting only the distinct ones).

The product of its digits is 2304, while the sum is 34.

The square root of 2211111988 is about 47022.4625897028. The cubic root of 2211111988 is about 1302.7774911618. Note that the first 3 decimals are identical.

The spelling of 2211111988 in words is "two billion, two hundred eleven million, one hundred eleven thousand, nine hundred eighty-eight".