1243624263421 has 4 divisors (see below), whose sum is σ = 1246431542112. Its totient is φ = 1240816984732.

The previous prime is 1243624263403. The next prime is 1243624263443.

1243624263421 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1243624263421 - 2⁵ = 1243624263389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243624263481) 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, 1403638681 + ... + 1403639566.

It is an arithmetic number, because the mean of its divisors is an integer number (311607885528).

Almost surely, 2^{1243624263421} is an apocalyptic number.

It is an amenable number.

1243624263421 is a deficient number, since it is larger than the sum of its proper divisors (2807278691).

1243624263421 is an equidigital number, since it uses as much as digits as its factorization.

1243624263421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2807278690.

The product of its digits is 331776, while the sum is 40.

The spelling of 1243624263421 in words is "one trillion, two hundred forty-three billion, six hundred twenty-four million, two hundred sixty-three thousand, four hundred twenty-one".