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BaseRepresentation
bin1001001001100110101100…
…01111011111110001110011
32122020120101111112120000021
410210303112033133301303
510114131230111413021
6110443321133104311
74144465422153040
oct444632617376163
978216344476007
1020121221201011
1164583a8899597
12230b764328097
13b2c5664a6548
144d7c2d8521c7
1524d5ec163c41
hex124cd63dfc73

20121221201011 has 8 divisors (see below), whose sum is σ = 22995895669344. Its totient is φ = 17246600306880.

The previous prime is 20121221201009. The next prime is 20121221201027. The reversal of 20121221201011 is 11010212212102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20121221201011 - 21 = 20121221201009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20121221201051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12585490 + ... + 14093863.

It is an arithmetic number, because the mean of its divisors is an integer number (2874486958668).

Almost surely, 220121221201011 is an apocalyptic number.

20121221201011 is a deficient number, since it is larger than the sum of its proper divisors (2874674468333).

20121221201011 is a wasteful number, since it uses less digits than its factorization.

20121221201011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26787101.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20121221201011 its reverse (11010212212102), we get a palindrome (31131433413113).

The spelling of 20121221201011 in words is "twenty trillion, one hundred twenty-one billion, two hundred twenty-one million, two hundred one thousand, eleven".