121220987647601 has 2 divisors, whose sum is σ = 121220987647602. Its totient is φ = 121220987647600.

The previous prime is 121220987647597. The next prime is 121220987647619. The reversal of 121220987647601 is 106746789022121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120904890696976 + 316096950625 = 10995676^2 + 562225^2 .

It is an emirp because it is prime and its reverse (106746789022121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121220987647601 - 2² = 121220987647597 is a prime.

It is a super-2 number, since 2×121220987647601² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121220987647681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610493823800 + 60610493823801.

It is an arithmetic number, because the mean of its divisors is an integer number (60610493823801).

Almost surely, 2^{121220987647601} is an apocalyptic number.

It is an amenable number.

121220987647601 is a deficient number, since it is larger than the sum of its proper divisors (1).

121220987647601 is an equidigital number, since it uses as much as digits as its factorization.

121220987647601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4064256, while the sum is 56.

The spelling of 121220987647601 in words is "one hundred twenty-one trillion, two hundred twenty billion, nine hundred eighty-seven million, six hundred forty-seven thousand, six hundred one".