427749353221 has 2 divisors, whose sum is σ = 427749353222. Its totient is φ = 427749353220.

The previous prime is 427749353209. The next prime is 427749353233. The reversal of 427749353221 is 122353947724.

It is a balanced prime because it is at equal distance from previous prime (427749353209) and next prime (427749353233).

It can be written as a sum of positive squares in only one way, i.e., 380301622596 + 47447730625 = 616686^2 + 217825^2 .

It is a cyclic number.

It is not a de Polignac number, because 427749353221 - 2¹³ = 427749345029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (427749353201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213874676610 + 213874676611.

It is an arithmetic number, because the mean of its divisors is an integer number (213874676611).

Almost surely, 2^427749353221 is an apocalyptic number.

It is an amenable number.

427749353221 is a deficient number, since it is larger than the sum of its proper divisors (1).

427749353221 is an equidigital number, since it uses as much as digits as its factorization.

427749353221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2540160, while the sum is 49.

The spelling of 427749353221 in words is "four hundred twenty-seven billion, seven hundred forty-nine million, three hundred fifty-three thousand, two hundred twenty-one".