16821212136 has 48 divisors (see below), whose sum is σ = 42753952800. Its totient is φ = 5515122240.

The previous prime is 16821212119. The next prime is 16821212153. The reversal of 16821212136 is 63121212861.

It is an interprime number because it is at equal distance from previous prime (16821212119) and next prime (16821212153).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 16821212097 and 16821212106.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4876 + ... + 183483.

It is an arithmetic number, because the mean of its divisors is an integer number (890707350).

Almost surely, 2^16821212136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16821212136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21376976400).

16821212136 is an abundant number, since it is smaller than the sum of its proper divisors (25932740664).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16821212136 is a wasteful number, since it uses less digits than its factorization.

16821212136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188490 (or 188425 counting only the distinct ones).

The product of its digits is 6912, while the sum is 33.

Adding to 16821212136 its reverse (63121212861), we get a palindrome (79942424997).

The spelling of 16821212136 in words is "sixteen billion, eight hundred twenty-one million, two hundred twelve thousand, one hundred thirty-six".