227221020 has 72 divisors (see below), whose sum is σ = 742262976. Its totient is φ = 55930752.

The previous prime is 227221009. The next prime is 227221021. The reversal of 227221020 is 20122722.

It is a happy number.

227221020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 227220984 and 227221002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (227221021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46212 + ... + 50891.

It is an arithmetic number, because the mean of its divisors is an integer number (10309208).

Almost surely, 2^227221020 is an apocalyptic number.

227221020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

227221020 is an abundant number, since it is smaller than the sum of its proper divisors (515041956).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

227221020 is a wasteful number, since it uses less digits than its factorization.

227221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97131 (or 97126 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 227221020 is about 15073.8521951093. The cubic root of 227221020 is about 610.2149381412.

Adding to 227221020 its reverse (20122722), we get a palindrome (247343742).

The spelling of 227221020 in words is "two hundred twenty-seven million, two hundred twenty-one thousand, twenty".