21000221211222 has 40 divisors (see below), whose sum is σ = 51333874076232. Its totient is φ = 6363703396800.

The previous prime is 21000221211217. The next prime is 21000221211239. The reversal of 21000221211222 is 22211212200012.

It is a happy number.

21000221211222 is a `hidden beast` number, since 2 + 10 + 0 + 0 + 221 + 211 + 222 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21000221211195 and 21000221211204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5892316179 + ... + 5892319742.

Almost surely, 2^{21000221211222} is an apocalyptic number.

21000221211222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21000221211222 is an abundant number, since it is smaller than the sum of its proper divisors (30333652865010).

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

21000221211222 is a wasteful number, since it uses less digits than its factorization.

21000221211222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11784635946 (or 11784635937 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21000221211222 its reverse (22211212200012), we get a palindrome (43211433411234).

The spelling of 21000221211222 in words is "twenty-one trillion, two hundred twenty-one million, two hundred eleven thousand, two hundred twenty-two".