21012220201120 has 96 divisors (see below), whose sum is σ = 51377771491200. Its totient is φ = 8111172228096.

The previous prime is 21012220201079. The next prime is 21012220201213. The reversal of 21012220201120 is 2110202221012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 21012220201094 and 21012220201103.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8598751 + ... + 10768609.

It is an arithmetic number, because the mean of its divisors is an integer number (535185119700).

Almost surely, 2^{21012220201120} is an apocalyptic number.

21012220201120 is a gapful number since it is divisible by the number (20) 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 21012220201120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25688885745600).

21012220201120 is an abundant number, since it is smaller than the sum of its proper divisors (30365551290080).

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

21012220201120 is a wasteful number, since it uses less digits than its factorization.

21012220201120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2171990 (or 2171982 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21012220201120 its reverse (2110202221012), we get a palindrome (23122422422132).

The spelling of 21012220201120 in words is "twenty-one trillion, twelve billion, two hundred twenty million, two hundred one thousand, one hundred twenty".