21222112222000 has 40 divisors (see below), whose sum is σ = 51315067357632. Its totient is φ = 8488844888000.

The previous prime is 21222112221991. The next prime is 21222112222009. The reversal of 21222112222000 is 22221122212.

It is an interprime number because it is at equal distance from previous prime (21222112221991) and next prime (21222112222009).

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (21222112222009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5305526056 + ... + 5305530055.

Almost surely, 2^{21222112222000} is an apocalyptic number.

21222112222000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222112222000 is an abundant number, since it is smaller than the sum of its proper divisors (30092955135632).

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

21222112222000 is a wasteful number, since it uses less digits than its factorization.

21222112222000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10611056134 (or 10611056118 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21222112222000 its reverse (22221122212), we get a palindrome (21244333344212).

The spelling of 21222112222000 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twelve million, two hundred twenty-two thousand".