1243400043421 has 8 divisors (see below), whose sum is σ = 1253220885504. Its totient is φ = 1233579674880.

The previous prime is 1243400043383. The next prime is 1243400043427.

1243400043421 is nontrivially palindromic in base 10.

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 1243400043421 - 2⁷ = 1243400043293 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1243400043421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243400043427) 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, 6695406 + ... + 6878608.

It is an arithmetic number, because the mean of its divisors is an integer number (156652610688).

Almost surely, 2^{1243400043421} is an apocalyptic number.

It is an amenable number.

1243400043421 is a deficient number, since it is larger than the sum of its proper divisors (9820842083).

1243400043421 is a wasteful number, since it uses less digits than its factorization.

1243400043421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236771.

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

It can be divided in two parts, 12434000 and 43421, that added together give a palindrome (12477421).

The spelling of 1243400043421 in words is "one trillion, two hundred forty-three billion, four hundred million, forty-three thousand, four hundred twenty-one".