121020553 has 2 divisors, whose sum is σ = 121020554. Its totient is φ = 121020552.

The previous prime is 121020547. The next prime is 121020563. The reversal of 121020553 is 355020121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119836809 + 1183744 = 10947^2 + 1088^2 .

It is an emirp because it is prime and its reverse (355020121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121020553 - 2⁵ = 121020521 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121020553.

It is not a weakly prime, because it can be changed into another prime (121020563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60510276 + 60510277.

It is an arithmetic number, because the mean of its divisors is an integer number (60510277).

Almost surely, 2^121020553 is an apocalyptic number.

It is an amenable number.

121020553 is a deficient number, since it is larger than the sum of its proper divisors (1).

121020553 is an equidigital number, since it uses as much as digits as its factorization.

121020553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 121020553 is about 11000.9341876043. The cubic root of 121020553 is about 494.6367474048.

Adding to 121020553 its reverse (355020121), we get a palindrome (476040674).

The spelling of 121020553 in words is "one hundred twenty-one million, twenty thousand, five hundred fifty-three".