231022220 has 48 divisors (see below), whose sum is σ = 569969568. Its totient is φ = 77544960.

The previous prime is 231022217. The next prime is 231022223. The reversal of 231022220 is 22220132.

231022220 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (231022217) and next prime (231022223).

It is a super-2 number, since 2×231022220² = 106742532267456800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231022195 and 231022204.

It is not an unprimeable number, because it can be changed into a prime (231022223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37529 + ... + 43248.

It is an arithmetic number, because the mean of its divisors is an integer number (11874366).

Almost surely, 2^231022220 is an apocalyptic number.

231022220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231022220 is an abundant number, since it is smaller than the sum of its proper divisors (338947348).

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

231022220 is a wasteful number, since it uses less digits than its factorization.

231022220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80810 (or 80808 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 231022220 is about 15199.4151203262. The cubic root of 231022220 is about 613.5989168286.

Adding to 231022220 its reverse (22220132), we get a palindrome (253242352).

The spelling of 231022220 in words is "two hundred thirty-one million, twenty-two thousand, two hundred twenty".