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101221220 = 2255061061
BaseRepresentation
bin1100000100010…
…00001101100100
321001110120102002
412002020031210
5201403034340
614013304432
72336236412
oct602101544
9231416362
10101221220
1152156001
1229a95118
1317c80619
14d62c2b2
158d46715
hex6088364

101221220 has 12 divisors (see below), whose sum is σ = 212564604. Its totient is φ = 40488480.

The previous prime is 101221201. The next prime is 101221259. The reversal of 101221220 is 22122101.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 42484324 + 58736896 = 6518^2 + 7664^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2530511 + ... + 2530550.

It is an arithmetic number, because the mean of its divisors is an integer number (17713717).

Almost surely, 2101221220 is an apocalyptic number.

101221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101221220 is an abundant number, since it is smaller than the sum of its proper divisors (111343384).

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

101221220 is a wasteful number, since it uses less digits than its factorization.

101221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5061070 (or 5061068 counting only the distinct ones).

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

The square root of 101221220 is about 10060.8757074124. The cubic root of 101221220 is about 466.0407106457.

Adding to 101221220 its reverse (22122101), we get a palindrome (123343321).

The spelling of 101221220 in words is "one hundred one million, two hundred twenty-one thousand, two hundred twenty".

Divisors: 1 2 4 5 10 20 5061061 10122122 20244244 25305305 50610610 101221220