378811810421 has 4 divisors (see below), whose sum is σ = 413249247744. Its totient is φ = 344374373100.

The previous prime is 378811810393. The next prime is 378811810423. The reversal of 378811810421 is 124018118873.

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 a de Polignac number, because none of the positive numbers 2^k-378811810421 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 (378811810423) 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, 17218718645 + ... + 17218718666.

It is an arithmetic number, because the mean of its divisors is an integer number (103312311936).

Almost surely, 2^378811810421 is an apocalyptic number.

It is an amenable number.

378811810421 is a deficient number, since it is larger than the sum of its proper divisors (34437437323).

378811810421 is a wasteful number, since it uses less digits than its factorization.

378811810421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34437437322.

The product of its (nonzero) digits is 86016, while the sum is 44.

The spelling of 378811810421 in words is "three hundred seventy-eight billion, eight hundred eleven million, eight hundred ten thousand, four hundred twenty-one".