221053645 has 16 divisors (see below), whose sum is σ = 268018560. Its totient is φ = 175017024.

The previous prime is 221053639. The next prime is 221053663. The reversal of 221053645 is 546350122.

It is a cyclic number.

It is not a de Polignac number, because 221053645 - 2¹⁹ = 220529357 is a prime.

It is a super-3 number, since 3×221053645³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 297144 + ... + 297886.

It is an arithmetic number, because the mean of its divisors is an integer number (16751160).

Almost surely, 2^221053645 is an apocalyptic number.

It is an amenable number.

221053645 is a deficient number, since it is larger than the sum of its proper divisors (46964915).

221053645 is a wasteful number, since it uses less digits than its factorization.

221053645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1284.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 221053645 is about 14867.8729144421. The cubic root of 221053645 is about 604.6432748961.

It can be divided in two parts, 2210 and 53645, that added together give a palindrome (55855).

The spelling of 221053645 in words is "two hundred twenty-one million, fifty-three thousand, six hundred forty-five".