101312220 has 48 divisors (see below), whose sum is σ = 285401088. Its totient is φ = 26852160.

The previous prime is 101312209. The next prime is 101312261. The reversal of 101312220 is 22213101.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 101312196 and 101312205.

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, 4965 + ... + 15075.

It is an arithmetic number, because the mean of its divisors is an integer number (5945856).

Almost surely, 2^101312220 is an apocalyptic number.

101312220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 101312220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142700544).

101312220 is an abundant number, since it is smaller than the sum of its proper divisors (184088868).

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

101312220 is a wasteful number, since it uses less digits than its factorization.

101312220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10290 (or 10288 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 101312220 is about 10065.3971605695. The cubic root of 101312220 is about 466.1803289390.

Adding to 101312220 its reverse (22213101), we get a palindrome (123525321).

The spelling of 101312220 in words is "one hundred one million, three hundred twelve thousand, two hundred twenty".