221406547408 has 10 divisors (see below), whose sum is σ = 428975185634. Its totient is φ = 110703273696.

The previous prime is 221406547381. The next prime is 221406547429. The reversal of 221406547408 is 804745604122.

It can be written as a sum of positive squares in only one way, i.e., 212436184464 + 8970362944 = 460908^2 + 94712^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6918954591 + ... + 6918954622.

Almost surely, 2^221406547408 is an apocalyptic number.

It is an amenable number.

221406547408 is a deficient number, since it is larger than the sum of its proper divisors (207568638226).

221406547408 is a wasteful number, since it uses less digits than its factorization.

221406547408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13837909221 (or 13837909215 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 43.

The spelling of 221406547408 in words is "two hundred twenty-one billion, four hundred six million, five hundred forty-seven thousand, four hundred eight".