221421255444745 has 4 divisors (see below), whose sum is σ = 265705506533700. Its totient is φ = 177137004355792.

The previous prime is 221421255444643. The next prime is 221421255444761. The reversal of 221421255444745 is 547444552124122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 109793345845824 + 111627909598921 = 10478232^2 + 10565411^2 .

It is a cyclic number.

It is not a de Polignac number, because 221421255444745 - 2⁷ = 221421255444617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221421255444692 and 221421255444701.

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, 22142125544470 + ... + 22142125544479.

It is an arithmetic number, because the mean of its divisors is an integer number (66426376633425).

Almost surely, 2^{221421255444745} is an apocalyptic number.

It is an amenable number.

221421255444745 is a deficient number, since it is larger than the sum of its proper divisors (44284251088955).

221421255444745 is an equidigital number, since it uses as much as digits as its factorization.

221421255444745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44284251088954.

The product of its digits is 14336000, while the sum is 52.

The spelling of 221421255444745 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred fifty-five million, four hundred forty-four thousand, seven hundred forty-five".