22131012220 has 48 divisors (see below), whose sum is σ = 48022684416. Its totient is φ = 8558208000.

The previous prime is 22131012191. The next prime is 22131012269. The reversal of 22131012220 is 2221013122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 22131012194 and 22131012203.

It is a congruent number.

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, 615540 + ... + 650500.

It is an arithmetic number, because the mean of its divisors is an integer number (1000472592).

Almost surely, 2^22131012220 is an apocalyptic number.

22131012220 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 22131012220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24011342208).

22131012220 is an abundant number, since it is smaller than the sum of its proper divisors (25891672196).

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

22131012220 is a wasteful number, since it uses less digits than its factorization.

22131012220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36022 (or 36020 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 22131012220 its reverse (2221013122), we get a palindrome (24352025342).

The spelling of 22131012220 in words is "twenty-two billion, one hundred thirty-one million, twelve thousand, two hundred twenty".