1241421204521 has 2 divisors, whose sum is σ = 1241421204522. Its totient is φ = 1241421204520.

The previous prime is 1241421204509. The next prime is 1241421204523. The reversal of 1241421204521 is 1254021241421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 714329232400 + 527091972121 = 845180^2 + 726011^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1241421204521 is a prime.

It is a super-2 number, since 2×1241421204521² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 1241421204523, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1241421204523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620710602260 + 620710602261.

It is an arithmetic number, because the mean of its divisors is an integer number (620710602261).

Almost surely, 2^{1241421204521} is an apocalyptic number.

It is an amenable number.

1241421204521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1241421204521 is an equidigital number, since it uses as much as digits as its factorization.

1241421204521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5120, while the sum is 29.

Adding to 1241421204521 its reverse (1254021241421), we get a palindrome (2495442445942).

The spelling of 1241421204521 in words is "one trillion, two hundred forty-one billion, four hundred twenty-one million, two hundred four thousand, five hundred twenty-one".