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121220111221831 is a prime number
BaseRepresentation
bin11011100011111111000001…
…101010110100010001000111
3120220012112021222022001211201
4123203333001222310101013
5111342032241433044311
61105451430022443331
734350602234355046
oct3343770152642107
9526175258261751
10121220111221831
1135696184645996
1211719329b93547
13528401346182b
1421d112855255d
15e0332ec2b9c1
hex6e3fc1ab4447

121220111221831 has 2 divisors, whose sum is σ = 121220111221832. Its totient is φ = 121220111221830.

The previous prime is 121220111221823. The next prime is 121220111221883. The reversal of 121220111221831 is 138122111022121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121220111221831 - 23 = 121220111221823 is a prime.

It is a super-2 number, since 2×1212201112218312 (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121220111221831.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121220111221031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610055610915 + 60610055610916.

It is an arithmetic number, because the mean of its divisors is an integer number (60610055610916).

Almost surely, 2121220111221831 is an apocalyptic number.

121220111221831 is a deficient number, since it is larger than the sum of its proper divisors (1).

121220111221831 is an equidigital number, since it uses as much as digits as its factorization.

121220111221831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 28.

Adding to 121220111221831 its reverse (138122111022121), we get a palindrome (259342222243952).

The spelling of 121220111221831 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred eleven million, two hundred twenty-one thousand, eight hundred thirty-one".