101213220 has 96 divisors (see below), whose sum is σ = 290949120. Its totient is φ = 26282880.

The previous prime is 101213207. The next prime is 101213227. The reversal of 101213220 is 22312101.

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 = 101213196 and 101213205.

It is not an unprimeable number, because it can be changed into a prime (101213227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 620859 + ... + 621021.

It is an arithmetic number, because the mean of its divisors is an integer number (3030720).

Almost surely, 2^101213220 is an apocalyptic number.

101213220 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 101213220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (145474560).

101213220 is an abundant number, since it is smaller than the sum of its proper divisors (189735900).

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

101213220 is a wasteful number, since it uses less digits than its factorization.

101213220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385 (or 383 counting only the distinct ones).

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

The square root of 101213220 is about 10060.4781198510. The cubic root of 101213220 is about 466.0284325091.

Adding to 101213220 its reverse (22312101), we get a palindrome (123525321).

The spelling of 101213220 in words is "one hundred one million, two hundred thirteen thousand, two hundred twenty".