221545454 has 8 divisors (see below), whose sum is σ = 357881160. Its totient is φ = 102251736.

The previous prime is 221545439. The next prime is 221545477. The reversal of 221545454 is 454545122.

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

It is a super-2 number, since 2×221545454² = 98164776376132232, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221545454.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4260464 + ... + 4260515.

It is an arithmetic number, because the mean of its divisors is an integer number (44735145).

Almost surely, 2^221545454 is an apocalyptic number.

221545454 is a deficient number, since it is larger than the sum of its proper divisors (136335706).

221545454 is a wasteful number, since it uses less digits than its factorization.

221545454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8520994.

The product of its digits is 32000, while the sum is 32.

The square root of 221545454 is about 14884.4030447983. The cubic root of 221545454 is about 605.0913542809.

The spelling of 221545454 in words is "two hundred twenty-one million, five hundred forty-five thousand, four hundred fifty-four".