221394554 has 8 divisors (see below), whose sum is σ = 332373780. Its totient is φ = 110603296.

The previous prime is 221394541. The next prime is 221394557. The reversal of 221394554 is 455493122.

It can be written as a sum of positive squares in 2 ways, for example, as 207504025 + 13890529 = 14405^2 + 3727^2 .

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

It is not an unprimeable number, because it can be changed into a prime (221394557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44009 + ... + 48780.

Almost surely, 2^221394554 is an apocalyptic number.

221394554 is a deficient number, since it is larger than the sum of its proper divisors (110979226).

221394554 is a wasteful number, since it uses less digits than its factorization.

221394554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93984.

The product of its digits is 43200, while the sum is 35.

The square root of 221394554 is about 14879.3331167764. Note that the first 3 decimals coincide. The cubic root of 221394554 is about 604.9539422625.

The spelling of 221394554 in words is "two hundred twenty-one million, three hundred ninety-four thousand, five hundred fifty-four".