22001221212222 has 32 divisors (see below), whose sum is σ = 52474962396672. Its totient is φ = 6012756107424.

The previous prime is 22001221212221. The next prime is 22001221212259. The reversal of 22001221212222 is 22221212210022.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22001221212221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11387794693 + ... + 11387796624.

It is an arithmetic number, because the mean of its divisors is an integer number (1639842574896).

Almost surely, 2^{22001221212222} is an apocalyptic number.

22001221212222 is an abundant number, since it is smaller than the sum of its proper divisors (30473741184450).

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

22001221212222 is a wasteful number, since it uses less digits than its factorization.

22001221212222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22775591352.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 22001221212222 its reverse (22221212210022), we get a palindrome (44222433422244).

The spelling of 22001221212222 in words is "twenty-two trillion, one billion, two hundred twenty-one million, two hundred twelve thousand, two hundred twenty-two".