821212119 has 36 divisors (see below), whose sum is σ = 1486013256. Its totient is φ = 433163808.

The previous prime is 821212109. The next prime is 821212123. The reversal of 821212119 is 911212128.

It is not a de Polignac number, because 821212119 - 2⁵ = 821212087 is a prime.

It is a super-2 number, since 2×821212119² = 1348778688784940322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 821212092 and 821212101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821212109) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 65889 + ... + 77354.

It is an arithmetic number, because the mean of its divisors is an integer number (41278146).

Almost surely, 2^821212119 is an apocalyptic number.

821212119 is a deficient number, since it is larger than the sum of its proper divisors (664801137).

821212119 is a wasteful number, since it uses less digits than its factorization.

821212119 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143276 (or 143266 counting only the distinct ones).

The product of its digits is 576, while the sum is 27.

The square root of 821212119 is about 28656.7988268055. The cubic root of 821212119 is about 936.4511269072.

Subtracting 821212119 from its reverse (911212128), we obtain a palindrome (90000009).

It can be divided in two parts, 82 and 1212119, that added together give a square (1212201 = 1101²).

The spelling of 821212119 in words is "eight hundred twenty-one million, two hundred twelve thousand, one hundred nineteen".