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20101221112 = 237358950377
BaseRepresentation
bin10010101110001000…
…000100101011111000
31220212212222211111211
4102232020010223320
5312131403033422
613122342532504
71311061363120
oct225610045370
956785884454
1020101221112
118585684a35
123a8ba37134
131b8465819b
14d89913c80
157c9ab2577
hex4ae204af8

20101221112 has 16 divisors (see below), whose sum is σ = 43074045360. Its totient is φ = 8614809024.

The previous prime is 20101221083. The next prime is 20101221143. The reversal of 20101221112 is 21112210102.

It is a junction number, because it is equal to n+sod(n) for n = 20101221092 and 20101221101.

It is a congruent number.

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, 179475133 + ... + 179475244.

It is an arithmetic number, because the mean of its divisors is an integer number (2692127835).

Almost surely, 220101221112 is an apocalyptic number.

It is an amenable number.

20101221112 is an abundant number, since it is smaller than the sum of its proper divisors (22972824248).

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

20101221112 is a wasteful number, since it uses less digits than its factorization.

20101221112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358950390 (or 358950386 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20101221112 its reverse (21112210102), we get a palindrome (41213431214).

The spelling of 20101221112 in words is "twenty billion, one hundred one million, two hundred twenty-one thousand, one hundred twelve".

Divisors: 1 2 4 7 8 14 28 56 358950377 717900754 1435801508 2512652639 2871603016 5025305278 10050610556 20101221112