1221021501053 has 2 divisors, whose sum is σ = 1221021501054. Its totient is φ = 1221021501052.

The previous prime is 1221021500977. The next prime is 1221021501083. The reversal of 1221021501053 is 3501051201221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 749632150969 + 471389350084 = 865813^2 + 686578^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221021501053 - 2¹² = 1221021496957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221021501083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610510750526 + 610510750527.

It is an arithmetic number, because the mean of its divisors is an integer number (610510750527).

Almost surely, 2^{1221021501053} is an apocalyptic number.

It is an amenable number.

1221021501053 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221021501053 is an equidigital number, since it uses as much as digits as its factorization.

1221021501053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 600, while the sum is 23.

Adding to 1221021501053 its reverse (3501051201221), we get a palindrome (4722072702274).

The spelling of 1221021501053 in words is "one trillion, two hundred twenty-one billion, twenty-one million, five hundred one thousand, fifty-three".