22201121020 has 72 divisors (see below), whose sum is σ = 51658958736. Its totient is φ = 8006648832.

The previous prime is 22201121009. The next prime is 22201121023. The reversal of 22201121020 is 2012110222.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22201121023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 68964 + ... + 221716.

It is an arithmetic number, because the mean of its divisors is an integer number (717485538).

Almost surely, 2^22201121020 is an apocalyptic number.

22201121020 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 22201121020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25829479368).

22201121020 is an abundant number, since it is smaller than the sum of its proper divisors (29457837716).

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

22201121020 is a wasteful number, since it uses less digits than its factorization.

22201121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152831 (or 152816 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 22201121020 its reverse (2012110222), we get a palindrome (24213231242).

The spelling of 22201121020 in words is "twenty-two billion, two hundred one million, one hundred twenty-one thousand, twenty".