1243266623421 has 32 divisors (see below), whose sum is σ = 1750500460800. Its totient is φ = 783848286720.

The previous prime is 1243266623411. The next prime is 1243266623479.

It is a happy number.

1243266623421 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1243266623421 - 2⁷ = 1243266623293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243266623411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 716440 + ... + 1731998.

It is an arithmetic number, because the mean of its divisors is an integer number (54703139400).

Almost surely, 2^{1243266623421} is an apocalyptic number.

It is an amenable number.

1243266623421 is a deficient number, since it is larger than the sum of its proper divisors (507233837379).

1243266623421 is a wasteful number, since it uses less digits than its factorization.

1243266623421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1015909.

The product of its digits is 497664, while the sum is 42.

The spelling of 1243266623421 in words is "one trillion, two hundred forty-three billion, two hundred sixty-six million, six hundred twenty-three thousand, four hundred twenty-one".