221345639045 has 16 divisors (see below), whose sum is σ = 268119400752. Its totient is φ = 175408558080.

The previous prime is 221345639029. The next prime is 221345639093. The reversal of 221345639045 is 540936543122.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 59527704289 + 161817934756 = 243983^2 + 402266^2 .

It is not a de Polignac number, because 221345639045 - 2⁴ = 221345639029 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221345638987 and 221345639005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 878705 + ... + 1102185.

It is an arithmetic number, because the mean of its divisors is an integer number (16757462547).

Almost surely, 2^221345639045 is an apocalyptic number.

It is an amenable number.

221345639045 is a deficient number, since it is larger than the sum of its proper divisors (46773761707).

221345639045 is a wasteful number, since it uses less digits than its factorization.

221345639045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225352.

The product of its (nonzero) digits is 777600, while the sum is 44.

The spelling of 221345639045 in words is "two hundred twenty-one billion, three hundred forty-five million, six hundred thirty-nine thousand, forty-five".