6219377921 has 4 divisors (see below), whose sum is σ = 6239248452. Its totient is φ = 6199507392.

The previous prime is 6219377911. The next prime is 6219377929. The reversal of 6219377921 is 1297739126.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 851764225 + 5367613696 = 29185^2 + 73264^2 .

It is a cyclic number.

It is not a de Polignac number, because 6219377921 - 2¹⁰ = 6219376897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6219377929) 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, 9934796 + ... + 9935421.

It is an arithmetic number, because the mean of its divisors is an integer number (1559812113).

Almost surely, 2^6219377921 is an apocalyptic number.

It is an amenable number.

6219377921 is a deficient number, since it is larger than the sum of its proper divisors (19870531).

6219377921 is a wasteful number, since it uses less digits than its factorization.

6219377921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19870530.

The product of its digits is 285768, while the sum is 47.

The square root of 6219377921 is about 78863.0326642338. The cubic root of 6219377921 is about 1839.0024839892.

The spelling of 6219377921 in words is "six billion, two hundred nineteen million, three hundred seventy-seven thousand, nine hundred twenty-one".