227470809721 has 9 divisors (see below), whose sum is σ = 228534067983. Its totient is φ = 226412482080.

The previous prime is 227470809673. The next prime is 227470809793. The reversal of 227470809721 is 127908074722.

The square root of 227470809721 is 476939.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 171074059321 + 56396750400 = 413611^2 + 237480^2 .

It is not a de Polignac number, because 227470809721 - 2¹³ = 227470801529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (227470809521) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 114941310 + ... + 114943288.

Almost surely, 2^227470809721 is an apocalyptic number.

227470809721 is the 476939-th square number.

227470809721 is the 238470-th centered octagonal number.

It is an amenable number.

227470809721 is a deficient number, since it is larger than the sum of its proper divisors (1063258262).

227470809721 is an frugal number, since it uses more digits than its factorization.

227470809721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4440 (or 2220 counting only the distinct ones).

The product of its (nonzero) digits is 790272, while the sum is 49.

Multiplying 227470809721 by its sum of digits (49), we get a square (11146069676329 = 3338573²).

The spelling of 227470809721 in words is "two hundred twenty-seven billion, four hundred seventy million, eight hundred nine thousand, seven hundred twenty-one".