10011221122221 has 24 divisors (see below), whose sum is σ = 15775356851904. Its totient is φ = 6067368538560.

The previous prime is 10011221122181. The next prime is 10011221122247. The reversal of 10011221122221 is 12222112211001.

10011221122221 is a `hidden beast` number, since 100 + 1 + 1 + 221 + 122 + 221 = 666.

It is not a de Polignac number, because 10011221122221 - 2²⁷ = 10011086904493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10011221122194 and 10011221122203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10011221122291) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29866665 + ... + 30200001.

It is an arithmetic number, because the mean of its divisors is an integer number (657306535496).

Almost surely, 2^{10011221122221} is an apocalyptic number.

10011221122221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10011221122221 is a deficient number, since it is larger than the sum of its proper divisors (5764135729683).

10011221122221 is a wasteful number, since it uses less digits than its factorization.

10011221122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636721 (or 636718 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 10011221122221 its reverse (12222112211001), we get a palindrome (22233333333222).

The spelling of 10011221122221 in words is "ten trillion, eleven billion, two hundred twenty-one million, one hundred twenty-two thousand, two hundred twenty-one".