2019941821 has 4 divisors (see below), whose sum is σ = 2020450432. Its totient is φ = 2019433212.

The previous prime is 2019941809. The next prime is 2019941839. The reversal of 2019941821 is 1281499102.

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 2019941821 - 2¹⁵ = 2019909053 is a prime.

It is a super-3 number, since 3×2019941821³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2019941801) 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, 248301 + ... + 256306.

It is an arithmetic number, because the mean of its divisors is an integer number (505112608).

Almost surely, 2^2019941821 is an apocalyptic number.

It is an amenable number.

2019941821 is a deficient number, since it is larger than the sum of its proper divisors (508611).

2019941821 is an equidigital number, since it uses as much as digits as its factorization.

2019941821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508610.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 2019941821 is about 44943.7628709480. The cubic root of 2019941821 is about 1264.0947286951.

The spelling of 2019941821 in words is "two billion, nineteen million, nine hundred forty-one thousand, eight hundred twenty-one".