1243020203421 has 16 divisors (see below), whose sum is σ = 1702570486848. Its totient is φ = 806085993600.

The previous prime is 1243020203353. The next prime is 1243020203423.

It is a happy number.

1243020203421 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1243020203421 - 2¹⁰ = 1243020202397 is a prime.

It is a super-2 number, since 2×1243020203421² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1243020203391 and 1243020203400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243020203423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 914560 + ... + 1822761.

It is an arithmetic number, because the mean of its divisors is an integer number (106410655428).

Almost surely, 2^{1243020203421} is an apocalyptic number.

It is an amenable number.

1243020203421 is a deficient number, since it is larger than the sum of its proper divisors (459550283427).

1243020203421 is a wasteful number, since it uses less digits than its factorization.

1243020203421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2741452.

The product of its (nonzero) digits is 2304, while the sum is 24.

It can be divided in two parts, 1243020 and 203421, that added together give a palindrome (1446441).

The spelling of 1243020203421 in words is "one trillion, two hundred forty-three billion, twenty million, two hundred three thousand, four hundred twenty-one".