21221200022211 has 30 divisors (see below), whose sum is σ = 36876446606340. Its totient is φ = 12126400010424.

The previous prime is 21221200022179. The next prime is 21221200022219. The reversal of 21221200022211 is 11222000212212.

It is a happy number.

21221200022211 is a `hidden beast` number, since 21 + 221 + 200 + 0 + 2 + 221 + 1 = 666.

It is not a de Polignac number, because 21221200022211 - 2⁵ = 21221200022179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21221200022219) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 2673364641 + ... + 2673372578.

It is an arithmetic number, because the mean of its divisors is an integer number (1229214886878).

Almost surely, 2^{21221200022211} is an apocalyptic number.

21221200022211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21221200022211 is a deficient number, since it is larger than the sum of its proper divisors (15655246584129).

21221200022211 is an equidigital number, since it uses as much as digits as its factorization.

21221200022211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5346737245 (or 5346737229 counting only the distinct ones).

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

Adding to 21221200022211 its reverse (11222000212212), we get a palindrome (32443200234423).

The spelling of 21221200022211 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred million, twenty-two thousand, two hundred eleven".