221554011 has 8 divisors (see below), whose sum is σ = 337606144. Its totient is φ = 126602280.

The previous prime is 221553989. The next prime is 221554031. The reversal of 221554011 is 110455122.

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

It is not a de Polignac number, because 221554011 - 2⁶ = 221553947 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 10550191 = 221554011 / (2 + 2 + 1 + 5 + 5 + 4 + 0 + 1 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221554031) 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, 5275075 + ... + 5275116.

It is an arithmetic number, because the mean of its divisors is an integer number (42200768).

Almost surely, 2^221554011 is an apocalyptic number.

221554011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

221554011 is a deficient number, since it is larger than the sum of its proper divisors (116052133).

221554011 is a wasteful number, since it uses less digits than its factorization.

221554011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10550201.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 221554011 is about 14884.6904905678. The cubic root of 221554011 is about 605.0991445559.

The spelling of 221554011 in words is "two hundred twenty-one million, five hundred fifty-four thousand, eleven".