121220002157 has 2 divisors, whose sum is σ = 121220002158. Its totient is φ = 121220002156.

The previous prime is 121220002133. The next prime is 121220002207. The reversal of 121220002157 is 751200022121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107496113956 + 13723888201 = 327866^2 + 117149^2 .

It is a cyclic number.

It is not a de Polignac number, because 121220002157 - 2²⁶ = 121152893293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121220502157) 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, 60610001078 + 60610001079.

It is an arithmetic number, because the mean of its divisors is an integer number (60610001079).

Almost surely, 2^121220002157 is an apocalyptic number.

It is an amenable number.

121220002157 is a deficient number, since it is larger than the sum of its proper divisors (1).

121220002157 is an equidigital number, since it uses as much as digits as its factorization.

121220002157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 560, while the sum is 23.

Adding to 121220002157 its reverse (751200022121), we get a palindrome (872420024278).

The spelling of 121220002157 in words is "one hundred twenty-one billion, two hundred twenty million, two thousand, one hundred fifty-seven".