22212120021 has 32 divisors (see below), whose sum is σ = 36623505408. Its totient is φ = 11660725440.

The previous prime is 22212120001. The next prime is 22212120037. The reversal of 22212120021 is 12002121222.

It is not a de Polignac number, because 22212120021 - 2⁵ = 22212119989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22212120001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 135201 + ... + 250406.

It is an arithmetic number, because the mean of its divisors is an integer number (1144484544).

Almost surely, 2^22212120021 is an apocalyptic number.

22212120021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22212120021 is a deficient number, since it is larger than the sum of its proper divisors (14411385387).

22212120021 is a wasteful number, since it uses less digits than its factorization.

22212120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385841.

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

Adding to 22212120021 its reverse (12002121222), we get a palindrome (34214241243).

The spelling of 22212120021 in words is "twenty-two billion, two hundred twelve million, one hundred twenty thousand, twenty-one".