221898990647 has 8 divisors (see below), whose sum is σ = 222077239440. Its totient is φ = 221720808960.

The previous prime is 221898990613. The next prime is 221898990653. The reversal of 221898990647 is 746099898122.

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

It is a cyclic number.

It is not a de Polignac number, because 221898990647 - 2¹⁸ = 221898728503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221898990697) 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, 8105879 + ... + 8133207.

It is an arithmetic number, because the mean of its divisors is an integer number (27759654930).

Almost surely, 2^221898990647 is an apocalyptic number.

221898990647 is a deficient number, since it is larger than the sum of its proper divisors (178248793).

221898990647 is a wasteful number, since it uses less digits than its factorization.

221898990647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33553.

The product of its (nonzero) digits is 31352832, while the sum is 65.

The spelling of 221898990647 in words is "two hundred twenty-one billion, eight hundred ninety-eight million, nine hundred ninety thousand, six hundred forty-seven".