47227017721 has 12 divisors (see below), whose sum is σ = 52386623100. Its totient is φ = 42530891520.

The previous prime is 47227017697. The next prime is 47227017763. The reversal of 47227017721 is 12771072274.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 24504771600 + 22722246121 = 156540^2 + 150739^2 .

It is not a de Polignac number, because 47227017721 - 2⁹ = 47227017209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47227017121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3400996 + ... + 3414853.

It is an arithmetic number, because the mean of its divisors is an integer number (4365551925).

Almost surely, 2^47227017721 is an apocalyptic number.

47227017721 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

47227017721 is a deficient number, since it is larger than the sum of its proper divisors (5159605379).

47227017721 is a wasteful number, since it uses less digits than its factorization.

47227017721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6815916 (or 6815903 counting only the distinct ones).

The product of its (nonzero) digits is 76832, while the sum is 40.

Adding to 47227017721 its reverse (12771072274), we get a palindrome (59998089995).

The spelling of 47227017721 in words is "forty-seven billion, two hundred twenty-seven million, seventeen thousand, seven hundred twenty-one".