419423787821 has 4 divisors (see below), whose sum is σ = 419425681500. Its totient is φ = 419421894144.

The previous prime is 419423787787. The next prime is 419423787883. The reversal of 419423787821 is 128787324914.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 128787324914 = 2 ⋅64393662457.

It can be written as a sum of positive squares in 2 ways, for example, as 327699002500 + 91724785321 = 572450^2 + 302861^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-419423787821 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 (419423987821) 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, 562646 + ... + 1074903.

It is an arithmetic number, because the mean of its divisors is an integer number (104856420375).

Almost surely, 2^419423787821 is an apocalyptic number.

It is an amenable number.

419423787821 is a deficient number, since it is larger than the sum of its proper divisors (1893679).

419423787821 is a wasteful number, since it uses less digits than its factorization.

419423787821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1893678.

The product of its digits is 5419008, while the sum is 56.

The spelling of 419423787821 in words is "four hundred nineteen billion, four hundred twenty-three million, seven hundred eighty-seven thousand, eight hundred twenty-one".