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21111010121211 = 349333319142979
BaseRepresentation
bin1001100110011010010100…
…10000100101010111111011
32202202012012121000101022120
410303031022100211113323
510231340322042334321
6112522133020452323
74306135340155113
oct463151220452773
982665177011276
1021111010121211
1167aa14693a05a
12244b5566aa0a3
13ba19b511b41a
1452dac7aac043
1526922c224ec6
hex13334a4255fb

21111010121211 has 16 divisors (see below), whose sum is σ = 28155222869760. Its totient is φ = 14070402384480.

The previous prime is 21111010121189. The next prime is 21111010121219. The reversal of 21111010121211 is 11212101011112.

It is not a de Polignac number, because 21111010121211 - 218 = 21111009859067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21111010121219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 491172120 + ... + 491215098.

It is an arithmetic number, because the mean of its divisors is an integer number (1759701429360).

Almost surely, 221111010121211 is an apocalyptic number.

21111010121211 is a deficient number, since it is larger than the sum of its proper divisors (7044212748549).

21111010121211 is a wasteful number, since it uses less digits than its factorization.

21111010121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81106.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 21111010121211 its reverse (11212101011112), we get a palindrome (32323111132323).

The spelling of 21111010121211 in words is "twenty-one trillion, one hundred eleven billion, ten million, one hundred twenty-one thousand, two hundred eleven".

Divisors: 1 3 4933 14799 33191 42979 99573 128937 163731203 212015407 491193609 636046221 1426515989 4279547967 7037003373737 21111010121211