121200212921 has 2 divisors, whose sum is σ = 121200212922. Its totient is φ = 121200212920.

The previous prime is 121200212839. The next prime is 121200212927. The reversal of 121200212921 is 129212002121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108020024896 + 13180188025 = 328664^2 + 114805^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121200212921 is a prime.

It is a super-2 number, since 2×121200212921² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121200212927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60600106460 + 60600106461.

It is an arithmetic number, because the mean of its divisors is an integer number (60600106461).

Almost surely, 2^121200212921 is an apocalyptic number.

It is an amenable number.

121200212921 is a deficient number, since it is larger than the sum of its proper divisors (1).

121200212921 is an equidigital number, since it uses as much as digits as its factorization.

121200212921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 121200212921 in words is "one hundred twenty-one billion, two hundred million, two hundred twelve thousand, nine hundred twenty-one".