105231220 has 48 divisors (see below), whose sum is σ = 226255680. Its totient is φ = 41099264.

The previous prime is 105231211. The next prime is 105231281. The reversal of 105231220 is 22132501.

It is a super-2 number, since 2×105231220² = 22147219325376800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 105231194 and 105231203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 303087 + ... + 303433.

It is an arithmetic number, because the mean of its divisors is an integer number (4713660).

Almost surely, 2^105231220 is an apocalyptic number.

105231220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

105231220 is an abundant number, since it is smaller than the sum of its proper divisors (121024460).

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

105231220 is a wasteful number, since it uses less digits than its factorization.

105231220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672 (or 670 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 105231220 is about 10258.2269423132. The cubic root of 105231220 is about 472.1154378666.

Adding to 105231220 its reverse (22132501), we get a palindrome (127363721).

The spelling of 105231220 in words is "one hundred five million, two hundred thirty-one thousand, two hundred twenty".