100001221123 has 2 divisors, whose sum is σ = 100001221124. Its totient is φ = 100001221122.

The previous prime is 100001221081. The next prime is 100001221127. The reversal of 100001221123 is 321122100001.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 100001221123 - 2¹⁷ = 100001090051 is a prime.

It is a super-2 number, since 2×100001221123² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (100001221127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50000610561 + 50000610562.

It is an arithmetic number, because the mean of its divisors is an integer number (50000610562).

Almost surely, 2^100001221123 is an apocalyptic number.

100001221123 is a deficient number, since it is larger than the sum of its proper divisors (1).

100001221123 is an equidigital number, since it uses as much as digits as its factorization.

100001221123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 100001221123 its reverse (321122100001), we get a palindrome (421123321124).

The spelling of 100001221123 in words is "one hundred billion, one million, two hundred twenty-one thousand, one hundred twenty-three".