2231216220 has 24 divisors (see below), whose sum is σ = 6247405584. Its totient is φ = 594990976.

The previous prime is 2231216219. The next prime is 2231216237. The reversal of 2231216220 is 226121322.

2231216220 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×2231216220³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18593409 + ... + 18593528.

It is an arithmetic number, because the mean of its divisors is an integer number (260308566).

Almost surely, 2^2231216220 is an apocalyptic number.

2231216220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2231216220 is an abundant number, since it is smaller than the sum of its proper divisors (4016189364).

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

2231216220 is a wasteful number, since it uses less digits than its factorization.

2231216220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37186949 (or 37186947 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 2231216220 is about 47235.7515024372. The cubic root of 2231216220 is about 1306.7140261480.

Adding to 2231216220 its reverse (226121322), we get a palindrome (2457337542).

The spelling of 2231216220 in words is "two billion, two hundred thirty-one million, two hundred sixteen thousand, two hundred twenty".