22120221012 has 12 divisors (see below), whose sum is σ = 51613849056. Its totient is φ = 7373407000.

The previous prime is 22120220999. The next prime is 22120221017. The reversal of 22120221012 is 21012202122.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 22120220982 and 22120221000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22120221017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 921675864 + ... + 921675887.

It is an arithmetic number, because the mean of its divisors is an integer number (4301154088).

Almost surely, 2^22120221012 is an apocalyptic number.

It is an amenable number.

22120221012 is an abundant number, since it is smaller than the sum of its proper divisors (29493628044).

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

22120221012 is a wasteful number, since it uses less digits than its factorization.

22120221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1843351758 (or 1843351756 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 22120221012 its reverse (21012202122), we get a palindrome (43132423134).

The spelling of 22120221012 in words is "twenty-two billion, one hundred twenty million, two hundred twenty-one thousand, twelve".