221122984 has 8 divisors (see below), whose sum is σ = 414605610. Its totient is φ = 110561488.

The previous prime is 221122949. The next prime is 221122991. The reversal of 221122984 is 489221122.

It can be written as a sum of positive squares in only one way, i.e., 221116900 + 6084 = 14870^2 + 78^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13820179 + ... + 13820194.

Almost surely, 2^221122984 is an apocalyptic number.

It is an amenable number.

221122984 is a deficient number, since it is larger than the sum of its proper divisors (193482626).

221122984 is a wasteful number, since it uses less digits than its factorization.

221122984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27640379 (or 27640375 counting only the distinct ones).

The product of its digits is 4608, while the sum is 31.

The square root of 221122984 is about 14870.2045715585. The cubic root of 221122984 is about 604.7064887782.

The spelling of 221122984 in words is "two hundred twenty-one million, one hundred twenty-two thousand, nine hundred eighty-four".