22201021044 has 18 divisors (see below), whose sum is σ = 56119247730. Its totient is φ = 7400340336.

The previous prime is 22201021043. The next prime is 22201021091. The reversal of 22201021044 is 44012010222.

It can be written as a sum of positive squares in only one way, i.e., 18228240144 + 3972780900 = 135012^2 + 63030^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×22201021044² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22201021043) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 308347479 + ... + 308347550.

It is an arithmetic number, because the mean of its divisors is an integer number (3117735985).

Almost surely, 2^22201021044 is an apocalyptic number.

It is an amenable number.

22201021044 is an abundant number, since it is smaller than the sum of its proper divisors (33918226686).

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

22201021044 is a wasteful number, since it uses less digits than its factorization.

22201021044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616695039 (or 616695034 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 22201021044 its reverse (44012010222), we get a palindrome (66213031266).

The spelling of 22201021044 in words is "twenty-two billion, two hundred one million, twenty-one thousand, forty-four".