1243421153 has 8 divisors (see below), whose sum is σ = 1370210688. Its totient is φ = 1121080464.

The previous prime is 1243421141. The next prime is 1243421171. The reversal of 1243421153 is 3511243421.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1243421153 - 2¹⁸ = 1243159009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243421353) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1111625 + ... + 1112742.

It is an arithmetic number, because the mean of its divisors is an integer number (171276336).

Almost surely, 2^1243421153 is an apocalyptic number.

1243421153 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1243421153 is a deficient number, since it is larger than the sum of its proper divisors (126789535).

1243421153 is a wasteful number, since it uses less digits than its factorization.

1243421153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2224423.

The product of its digits is 2880, while the sum is 26.

The square root of 1243421153 is about 35262.1773717960. The cubic root of 1243421153 is about 1075.3241936942.

Adding to 1243421153 its reverse (3511243421), we get a palindrome (4754664574).

The spelling of 1243421153 in words is "one billion, two hundred forty-three million, four hundred twenty-one thousand, one hundred fifty-three".