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11111221202221 = 722715794428491
BaseRepresentation
bin1010000110110000100001…
…1001001000110100101101
31110100020000002222011012101
42201230020121020310231
52424021240111432341
635344231411535101
72224521263616160
oct241541031106455
943306002864171
1011111221202221
1135a4273777358
1212b55195ba491
13627a25929b0a
15144065ac9831
hexa1b08648d2d

11111221202221 has 16 divisors (see below), whose sum is σ = 12762559664640. Its totient is φ = 9475941190320.

The previous prime is 11111221202209. The next prime is 11111221202227. The reversal of 11111221202221 is 12220212211111.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 11111221202221 - 221 = 11111219105069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111221202227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 294786 + ... + 4723276.

It is an arithmetic number, because the mean of its divisors is an integer number (797659979040).

Almost surely, 211111221202221 is an apocalyptic number.

It is an amenable number.

11111221202221 is a deficient number, since it is larger than the sum of its proper divisors (1651338462419).

11111221202221 is a wasteful number, since it uses less digits than its factorization.

11111221202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4430304.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 11111221202221 its reverse (12220212211111), we get a palindrome (23331433413332).

The spelling of 11111221202221 in words is "eleven trillion, one hundred eleven billion, two hundred twenty-one million, two hundred two thousand, two hundred twenty-one".