22012001220 has 96 divisors (see below), whose sum is σ = 70775470080. Its totient is φ = 5055384960.

The previous prime is 22012001203. The next prime is 22012001227. The reversal of 22012001220 is 2210021022.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 22012001196 and 22012001205.

It is not an unprimeable number, because it can be changed into a prime (22012001227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 865132 + ... + 890211.

It is an arithmetic number, because the mean of its divisors is an integer number (737244480).

Almost surely, 2^22012001220 is an apocalyptic number.

22012001220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22012001220 is an abundant number, since it is smaller than the sum of its proper divisors (48763468860).

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

22012001220 is a wasteful number, since it uses less digits than its factorization.

22012001220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1755385 (or 1755383 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 22012001220 its reverse (2210021022), we get a palindrome (24222022242).

The spelling of 22012001220 in words is "twenty-two billion, twelve million, one thousand, two hundred twenty".