27745206221 has 8 divisors (see below), whose sum is σ = 29243485080. Its totient is φ = 26283030592.

The previous prime is 27745206197. The next prime is 27745206259. The reversal of 27745206221 is 12260254772.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11619762025 + 16125444196 = 107795^2 + 126986^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 27745206221 - 2⁶ = 27745206157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27745208221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9024230 + ... + 9027303.

It is an arithmetic number, because the mean of its divisors is an integer number (3655435635).

Almost surely, 2^27745206221 is an apocalyptic number.

It is an amenable number.

27745206221 is a deficient number, since it is larger than the sum of its proper divisors (1498278859).

27745206221 is a wasteful number, since it uses less digits than its factorization.

27745206221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18051615.

The product of its (nonzero) digits is 94080, while the sum is 38.

The spelling of 27745206221 in words is "twenty-seven billion, seven hundred forty-five million, two hundred six thousand, two hundred twenty-one".