1240121021353 has 2 divisors, whose sum is σ = 1240121021354. Its totient is φ = 1240121021352.

The previous prime is 1240121021327. The next prime is 1240121021387. The reversal of 1240121021353 is 3531201210421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1221935689744 + 18185331609 = 1105412^2 + 134853^2 .

It is a cyclic number.

It is not a de Polignac number, because 1240121021353 - 2²¹ = 1240118924201 is a prime.

It is not a weakly prime, because it can be changed into another prime (1240121021453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620060510676 + 620060510677.

It is an arithmetic number, because the mean of its divisors is an integer number (620060510677).

Almost surely, 2^{1240121021353} is an apocalyptic number.

It is an amenable number.

1240121021353 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240121021353 is an equidigital number, since it uses as much as digits as its factorization.

1240121021353 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 1240121021353 its reverse (3531201210421), we get a palindrome (4771322231774).

The spelling of 1240121021353 in words is "one trillion, two hundred forty billion, one hundred twenty-one million, twenty-one thousand, three hundred fifty-three".