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11211001221 = 372937497537
BaseRepresentation
bin10100111000011101…
…00100110110000101
31001221022110212111110
422130032210312011
5140430004014341
65052242355233
7544550636520
oct123416446605
931838425443
1011211001221
114833355172
12220a65bb19
131098864144
14784d17bb7
1545936d216
hex29c3a4d85

11211001221 has 32 divisors (see below), whose sum is σ = 18150186240. Its totient is φ = 6018195456.

The previous prime is 11211001213. The next prime is 11211001247. The reversal of 11211001221 is 12210011211.

It is not a de Polignac number, because 11211001221 - 23 = 11211001213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11211001197 and 11211001206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211001201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 226236 + ... + 271301.

It is an arithmetic number, because the mean of its divisors is an integer number (567193320).

Almost surely, 211211001221 is an apocalyptic number.

It is an amenable number.

11211001221 is a deficient number, since it is larger than the sum of its proper divisors (6939185019).

11211001221 is a wasteful number, since it uses less digits than its factorization.

11211001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497613.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 11211001221 its reverse (12210011211), we get a palindrome (23421012432).

The spelling of 11211001221 in words is "eleven billion, two hundred eleven million, one thousand, two hundred twenty-one".

Divisors: 1 3 7 21 29 37 87 111 203 259 609 777 1073 3219 7511 22533 497537 1492611 3482759 10448277 14428573 18408869 43285719 55226607 101000011 128862083 303000033 386586249 533857201 1601571603 3737000407 11211001221