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101221212 = 22343119571
BaseRepresentation
bin1100000100010…
…00001101011100
321001110120101210
412002020031130
5201403034322
614013304420
72336236401
oct602101534
9231416353
10101221212
1152155aa4
1229a95110
1317c80611
14d62c2a8
158d4670c
hex608835c

101221212 has 24 divisors (see below), whose sum is σ = 236742912. Its totient is φ = 33660400.

The previous prime is 101221201. The next prime is 101221259. The reversal of 101221212 is 212122101.

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

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, 4614 + ... + 14957.

It is an arithmetic number, because the mean of its divisors is an integer number (9864288).

Almost surely, 2101221212 is an apocalyptic number.

101221212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

101221212 is an abundant number, since it is smaller than the sum of its proper divisors (135521700).

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

101221212 is a wasteful number, since it uses less digits than its factorization.

101221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20009 (or 20007 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 101221212 is about 10060.8753098326. The cubic root of 101221212 is about 466.0406983679.

Adding to 101221212 its reverse (212122101), we get a palindrome (313343313).

The spelling of 101221212 in words is "one hundred one million, two hundred twenty-one thousand, two hundred twelve".

Divisors: 1 2 3 4 6 12 431 862 1293 1724 2586 5172 19571 39142 58713 78284 117426 234852 8435101 16870202 25305303 33740404 50610606 101221212