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BaseRepresentation
bin11011100011111111000001…
…101010110100001100110001
3120220012112021222022001110102
4123203333001222310030301
5111342032241433042203
61105451430022442145
734350602234354201
oct3343770152641461
9526175258261412
10121220111221553
1135696184645763
1211719329b93355
135284013461676
1421d1128552401
15e0332ec2b888
hex6e3fc1ab4331

121220111221553 has 2 divisors, whose sum is σ = 121220111221554. Its totient is φ = 121220111221552.

The previous prime is 121220111221541. The next prime is 121220111221591. The reversal of 121220111221553 is 355122111022121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74136525606049 + 47083585615504 = 8610257^2 + 6861748^2 .

It is a cyclic number.

It is not a de Polignac number, because 121220111221553 - 232 = 121215816254257 is a prime.

It is not a weakly prime, because it can be changed into another prime (121220111221513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610055610776 + 60610055610777.

It is an arithmetic number, because the mean of its divisors is an integer number (60610055610777).

Almost surely, 2121220111221553 is an apocalyptic number.

It is an amenable number.

121220111221553 is a deficient number, since it is larger than the sum of its proper divisors (1).

121220111221553 is an equidigital number, since it uses as much as digits as its factorization.

121220111221553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 29.

Adding to 121220111221553 its reverse (355122111022121), we get a palindrome (476342222243674).

The spelling of 121220111221553 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred eleven million, two hundred twenty-one thousand, five hundred fifty-three".