Search a number
BaseRepresentation
bin101111100110011101…
…0000100001001100101
3100202212000202201022222
41133030322010021211
53133322314134341
6114543220402125
710246104562325
oct1371472041145
9322760681288
10102222021221
113a396736581
1217989b46345
139840c814b8
144d3a1d1285
1529d435644b
hex17cce84265

102222021221 has 2 divisors, whose sum is σ = 102222021222. Its totient is φ = 102222021220.

The previous prime is 102222021191. The next prime is 102222021257. The reversal of 102222021221 is 122120222201.

Adding to 102222021221 its reverse (122120222201), we get a palindrome (224342243422).

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54867909121 + 47354112100 = 234239^2 + 217610^2 .

It is an emirp because it is prime and its reverse (122120222201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102222021221 - 26 = 102222021157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 102222021221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102222024221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51111010610 + 51111010611.

It is an arithmetic number, because the mean of its divisors is an integer number (51111010611).

Almost surely, 2102222021221 is an apocalyptic number.

It is an amenable number.

102222021221 is a deficient number, since it is larger than the sum of its proper divisors (1).

102222021221 is an equidigital number, since it uses as much as digits as its factorization.

102222021221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

The spelling of 102222021221 in words is "one hundred two billion, two hundred twenty-two million, twenty-one thousand, two hundred twenty-one".