221040988 has 12 divisors (see below), whose sum is σ = 442082032. Its totient is φ = 94731840.

The previous prime is 221040979. The next prime is 221041019. The reversal of 221040988 is 889040122.

221040988 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

221040988 is an admirable number.

It is a super-2 number, since 2×221040988² = 97718236752032288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3947133 + ... + 3947188.

Almost surely, 2^221040988 is an apocalyptic number.

221040988 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

221040988 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221040988 is a wasteful number, since it uses less digits than its factorization.

221040988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7894332 (or 7894330 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 221040988 is about 14867.4472590287. The cubic root of 221040988 is about 604.6317345360.

The spelling of 221040988 in words is "two hundred twenty-one million, forty thousand, nine hundred eighty-eight".