221214009987 has 16 divisors (see below), whose sum is σ = 327794688000. Its totient is φ = 147444403752.

The previous prime is 221214009983. The next prime is 221214010013. The reversal of 221214009987 is 789900412122.

It is not a de Polignac number, because 221214009987 - 2² = 221214009983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221214009983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 749187 + ... + 1001852.

It is an arithmetic number, because the mean of its divisors is an integer number (20487168000).

Almost surely, 2^221214009987 is an apocalyptic number.

221214009987 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

221214009987 is a deficient number, since it is larger than the sum of its proper divisors (106580678013).

221214009987 is a wasteful number, since it uses less digits than its factorization.

221214009987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1755727 (or 1755721 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The spelling of 221214009987 in words is "two hundred twenty-one billion, two hundred fourteen million, nine thousand, nine hundred eighty-seven".