22121221012 has 12 divisors (see below), whose sum is σ = 42231422016. Its totient is φ = 10055100440.

The previous prime is 22121221009. The next prime is 22121221013. The reversal of 22121221012 is 21012212122.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121221013) 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, 251377468 + ... + 251377555.

It is an arithmetic number, because the mean of its divisors is an integer number (3519285168).

Almost surely, 2^22121221012 is an apocalyptic number.

22121221012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

22121221012 is a deficient number, since it is larger than the sum of its proper divisors (20110201004).

22121221012 is a wasteful number, since it uses less digits than its factorization.

22121221012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502755038 (or 502755036 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 22121221012 its reverse (21012212122), we get a palindrome (43133433134).

The spelling of 22121221012 in words is "twenty-two billion, one hundred twenty-one million, two hundred twenty-one thousand, twelve".