1242421220233 has 4 divisors (see below), whose sum is σ = 1242427005508. Its totient is φ = 1242415434960.

The previous prime is 1242421220191. The next prime is 1242421220267. The reversal of 1242421220233 is 3320221242421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 405174260089 + 837246960144 = 636533^2 + 915012^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242421220233 - 2²⁵ = 1242387665801 is a prime.

It is a super-2 number, since 2×1242421220233² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242421290233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2557566 + ... + 3004327.

It is an arithmetic number, because the mean of its divisors is an integer number (310606751377).

Almost surely, 2^{1242421220233} is an apocalyptic number.

It is an amenable number.

1242421220233 is a deficient number, since it is larger than the sum of its proper divisors (5785275).

1242421220233 is an equidigital number, since it uses as much as digits as its factorization.

1242421220233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5785274.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 1242421220233 its reverse (3320221242421), we get a palindrome (4562642462654).

The spelling of 1242421220233 in words is "one trillion, two hundred forty-two billion, four hundred twenty-one million, two hundred twenty thousand, two hundred thirty-three".