221347409487 has 8 divisors (see below), whose sum is σ = 295141836720. Its totient is φ = 147558960960.

The previous prime is 221347409473. The next prime is 221347409509. The reversal of 221347409487 is 784904743122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221347409487 - 2⁴ = 221347409471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221347409447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1407564 + ... + 1556897.

It is an arithmetic number, because the mean of its divisors is an integer number (36892729590).

Almost surely, 2^221347409487 is an apocalyptic number.

221347409487 is a deficient number, since it is larger than the sum of its proper divisors (73794427233).

221347409487 is a wasteful number, since it uses less digits than its factorization.

221347409487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2989353.

The product of its (nonzero) digits is 2709504, while the sum is 51.

The spelling of 221347409487 in words is "two hundred twenty-one billion, three hundred forty-seven million, four hundred nine thousand, four hundred eighty-seven".