20021412216 has 128 divisors (see below), whose sum is σ = 54822862080. Its totient is φ = 6055796736.

The previous prime is 20021412179. The next prime is 20021412221. The reversal of 20021412216 is 61221412002.

It is a junction number, because it is equal to n+sod(n) for n = 20021412192 and 20021412201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16450840 + ... + 16452056.

It is an arithmetic number, because the mean of its divisors is an integer number (428303610).

Almost surely, 2^20021412216 is an apocalyptic number.

20021412216 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20021412216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27411431040).

20021412216 is an abundant number, since it is smaller than the sum of its proper divisors (34801449864).

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

20021412216 is a wasteful number, since it uses less digits than its factorization.

20021412216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2093 (or 2089 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 20021412216 its reverse (61221412002), we get a palindrome (81242824218).

The spelling of 20021412216 in words is "twenty billion, twenty-one million, four hundred twelve thousand, two hundred sixteen".