2121819 has 24 divisors (see below), whose sum is σ = 3397632. Its totient is φ = 1153680.

The previous prime is 2121809. The next prime is 2121829. The reversal of 2121819 is 9181212.

It is an interprime number because it is at equal distance from previous prime (2121809) and next prime (2121829).

It is not a de Polignac number, because 2121819 - 2⁴ = 2121803 is a prime.

It is a super-2 number, since 2×2121819² = 9004231737522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2121809) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11014 + ... + 11204.

It is an arithmetic number, because the mean of its divisors is an integer number (141568).

2^2121819 is an apocalyptic number.

2121819 is a deficient number, since it is larger than the sum of its proper divisors (1275813).

2121819 is a wasteful number, since it uses less digits than its factorization.

2121819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247 (or 224 counting only the distinct ones).

The product of its digits is 288, while the sum is 24.

The square root of 2121819 is about 1456.6464910883. The cubic root of 2121819 is about 128.4998965414.

The spelling of 2121819 in words is "two million, one hundred twenty-one thousand, eight hundred nineteen".