2819191821 has 12 divisors (see below), whose sum is σ = 3993043392. Its totient is φ = 1768904128.

The previous prime is 2819191813. The next prime is 2819191831. The reversal of 2819191821 is 1281919182.

It is a happy number.

It is not a de Polignac number, because 2819191821 - 2³ = 2819191813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2819191831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1624965 + ... + 1626698.

It is an arithmetic number, because the mean of its divisors is an integer number (332753616).

Almost surely, 2^2819191821 is an apocalyptic number.

It is an amenable number.

2819191821 is a deficient number, since it is larger than the sum of its proper divisors (1173851571).

2819191821 is a wasteful number, since it uses less digits than its factorization.

2819191821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3251700 (or 3251683 counting only the distinct ones).

The product of its digits is 20736, while the sum is 42.

The square root of 2819191821 is about 53096.0621986226. The cubic root of 2819191821 is about 1412.6726667663.

The spelling of 2819191821 in words is "two billion, eight hundred nineteen million, one hundred ninety-one thousand, eight hundred twenty-one".