221616073045 has 8 divisors (see below), whose sum is σ = 268572350520. Its totient is φ = 175537483200.

The previous prime is 221616073039. The next prime is 221616073067. The reversal of 221616073045 is 540370616122.

It can be written as a sum of positive squares in 4 ways, for example, as 86402487249 + 135213585796 = 293943^2 + 367714^2 .

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

It is not a de Polignac number, because 221616073045 - 2⁷ = 221616072917 is a prime.

It is a super-2 number, since 2×221616073045² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221616072995 and 221616073013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 219421350 + ... + 219422359.

It is an arithmetic number, because the mean of its divisors is an integer number (33571543815).

Almost surely, 2^221616073045 is an apocalyptic number.

It is an amenable number.

221616073045 is a deficient number, since it is larger than the sum of its proper divisors (46956277475).

221616073045 is a wasteful number, since it uses less digits than its factorization.

221616073045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438843815.

The product of its (nonzero) digits is 60480, while the sum is 37.

Adding to 221616073045 its reverse (540370616122), we get a palindrome (761986689167).

The spelling of 221616073045 in words is "two hundred twenty-one billion, six hundred sixteen million, seventy-three thousand, forty-five".