121221100069 has 2 divisors, whose sum is σ = 121221100070. Its totient is φ = 121221100068.

The previous prime is 121221100067. The next prime is 121221100109. The reversal of 121221100069 is 960001122121.

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., 75109979844 + 46111120225 = 274062^2 + 214735^2 .

It is a cyclic number.

It is not a de Polignac number, because 121221100069 - 2¹ = 121221100067 is a prime.

It is a super-2 number, since 2×121221100069² (a number of 23 digits) contains 22 as substring.

Together with 121221100067, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121221100067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610550034 + 60610550035.

It is an arithmetic number, because the mean of its divisors is an integer number (60610550035).

Almost surely, 2^121221100069 is an apocalyptic number.

It is an amenable number.

121221100069 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221100069 is an equidigital number, since it uses as much as digits as its factorization.

121221100069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 25.

The spelling of 121221100069 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred thousand, sixty-nine".