787945123421 has 4 divisors (see below), whose sum is σ = 822203607072. Its totient is φ = 753686639772.

The previous prime is 787945123409. The next prime is 787945123423. The reversal of 787945123421 is 124321549787.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 124321549787 = 709 ⋅175347743.

It is a cyclic number.

It is not a de Polignac number, because 787945123421 - 2²⁶ = 787878014557 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 (787945123423) 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 3 ways as a sum of consecutive naturals, for example, 17129241791 + ... + 17129241836.

It is an arithmetic number, because the mean of its divisors is an integer number (205550901768).

Almost surely, 2^787945123421 is an apocalyptic number.

It is an amenable number.

787945123421 is a deficient number, since it is larger than the sum of its proper divisors (34258483651).

787945123421 is a wasteful number, since it uses less digits than its factorization.

787945123421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34258483650.

The product of its digits is 3386880, while the sum is 53.

The spelling of 787945123421 in words is "seven hundred eighty-seven billion, nine hundred forty-five million, one hundred twenty-three thousand, four hundred twenty-one".