101212220 has 24 divisors (see below), whose sum is σ = 225049104. Its totient is φ = 38103296.

The previous prime is 101212219. The next prime is 101212249. The reversal of 101212220 is 22212101.

It is a happy number.

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, 148502 + ... + 149181.

It is an arithmetic number, because the mean of its divisors is an integer number (9377046).

Almost surely, 2^101212220 is an apocalyptic number.

101212220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101212220 is an abundant number, since it is smaller than the sum of its proper divisors (123836884).

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

101212220 is a wasteful number, since it uses less digits than its factorization.

101212220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297709 (or 297707 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 101212220 is about 10060.4284203010. The cubic root of 101212220 is about 466.0268976965.

Adding to 101212220 its reverse (22212101), we get a palindrome (123424321).

The spelling of 101212220 in words is "one hundred one million, two hundred twelve thousand, two hundred twenty".