1242020202421 has 2 divisors, whose sum is σ = 1242020202422. Its totient is φ = 1242020202420.

The previous prime is 1242020202361. The next prime is 1242020202433.

1242020202421 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 689207134225 + 552813068196 = 830185^2 + 743514^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 1242020202421 - 2¹¹ = 1242020200373 is a prime.

It is a super-2 number, since 2×1242020202421² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1242020202392 and 1242020202401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242020202491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621010101210 + 621010101211.

It is an arithmetic number, because the mean of its divisors is an integer number (621010101211).

Almost surely, 2^{1242020202421} is an apocalyptic number.

It is an amenable number.

1242020202421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242020202421 is an equidigital number, since it uses as much as digits as its factorization.

1242020202421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1024, while the sum is 22.

It can be divided in two parts, 1242020 and 202421, that added together give a palindrome (1444441).

The spelling of 1242020202421 in words is "one trillion, two hundred forty-two billion, twenty million, two hundred two thousand, four hundred twenty-one".