2019764221 has 4 divisors (see below), whose sum is σ = 2031048000. Its totient is φ = 2008480444.

The previous prime is 2019764209. The next prime is 2019764249. The reversal of 2019764221 is 1224679102.

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 not a de Polignac number, because 2019764221 - 2⁷ = 2019764093 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 (2019764281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5641621 + ... + 5641978.

It is an arithmetic number, because the mean of its divisors is an integer number (507762000).

Almost surely, 2^2019764221 is an apocalyptic number.

It is an amenable number.

2019764221 is a deficient number, since it is larger than the sum of its proper divisors (11283779).

2019764221 is a wasteful number, since it uses less digits than its factorization.

2019764221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11283778.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 2019764221 is about 44941.7870249949. The cubic root of 2019764221 is about 1264.0576798056.

The spelling of 2019764221 in words is "two billion, nineteen million, seven hundred sixty-four thousand, two hundred twenty-one".