121210553 has 2 divisors, whose sum is σ = 121210554. Its totient is φ = 121210552.

The previous prime is 121210511. The next prime is 121210597. The reversal of 121210553 is 355012121.

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., 99940009 + 21270544 = 9997^2 + 4612^2 .

It is an emirp because it is prime and its reverse (355012121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121210553 - 2⁶ = 121210489 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (121215553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60605276 + 60605277.

It is an arithmetic number, because the mean of its divisors is an integer number (60605277).

Almost surely, 2^121210553 is an apocalyptic number.

It is an amenable number.

121210553 is a deficient number, since it is larger than the sum of its proper divisors (1).

121210553 is an equidigital number, since it uses as much as digits as its factorization.

121210553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 121210553 is about 11009.5664310635. The cubic root of 121210553 is about 494.8954688636.

Adding to 121210553 its reverse (355012121), we get a palindrome (476222674).

The spelling of 121210553 in words is "one hundred twenty-one million, two hundred ten thousand, five hundred fifty-three".